Document and Entity Information - shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jul. 31, 2018 |
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| Document Document And Entity Information [Abstract] | ||
| Entity Registrant Name | CHESAPEAKE UTILITIES CORP | |
| Trading Symbol | CPK | |
| Entity Central Index Key | 0000019745 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Filer Category | Large Accelerated Filer | |
| Document Type | 10-Q | |
| Document Period End Date | Jun. 30, 2018 | |
| Document Fiscal Year Focus | 2018 | |
| Document Fiscal Period Focus | Q2 | |
| Amendment Flag | false | |
| Entity Common Stock, Shares Outstanding | 16,378,545 |
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- Definition Document Document and Entity Information [Abstract] No definition available.
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- Definition If the value is true, then the document is an amendment to previously-filed/accepted document. No definition available.
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- Definition End date of current fiscal year in the format --MM-DD. No definition available.
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- Definition This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY. No definition available.
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- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. No definition available.
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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. No definition available.
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- Definition The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other". No definition available.
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- Definition A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. No definition available.
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- Definition Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated) or (5) Smaller Reporting Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure. No definition available.
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- Definition The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Trading symbol of an instrument as listed on an exchange. No definition available.
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Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Operating Revenues | ||||
| Regulated Energy | $ 70,504 | $ 70,996 | $ 179,897 | $ 168,650 |
| Unregulated Energy and other | 66,160 | 54,088 | 196,123 | 141,594 |
| Total Operating Revenues | 136,664 | 125,084 | 376,020 | 310,244 |
| Operating Expenses | ||||
| Regulated Energy cost of sales | 20,010 | 24,167 | 68,241 | 64,411 |
| Unregulated Energy and other cost of sales | 49,393 | 40,505 | 149,219 | 101,260 |
| Operations | 36,281 | 30,013 | 68,983 | 62,502 |
| Maintenance | 3,619 | 3,403 | 7,211 | 6,634 |
| Gain From A Settlement | (130) | (130) | (130) | (130) |
| Depreciation and amortization | 9,839 | 9,094 | 19,543 | 17,906 |
| Other taxes | 4,404 | 3,971 | 9,299 | 8,501 |
| Total Operating Expenses | 123,416 | 111,023 | 322,366 | 261,084 |
| Operating Income | 13,248 | 14,061 | 53,654 | 49,160 |
| Other expense, net | (262) | (1,002) | (194) | (1,703) |
| Interest charges | 3,881 | 3,073 | 7,545 | 5,811 |
| Income Before Income Taxes | 9,105 | 9,986 | 45,915 | 41,646 |
| Income taxes | 2,718 | 3,940 | 12,674 | 16,456 |
| Net Income | $ 6,387 | $ 6,046 | $ 33,241 | $ 25,190 |
| Weighted Average Common Shares Outstanding: | ||||
| Basic (shares) | 16,369,641 | 16,340,665 | 16,360,540 | 16,329,009 |
| Diluted (shares) | 16,417,082 | 16,382,207 | 16,410,061 | 16,373,038 |
| Earnings Per Share of Common Stock: | ||||
| Basic (in dollars per share) | $ 0.39 | $ 0.37 | $ 2.03 | $ 1.54 |
| Diluted (in dollars per share) | 0.39 | 0.37 | 2.03 | 1.54 |
| Cash Dividends Declared Per Share of Common Stock (in dollars per share) | $ 0.370 | $ 0.325 | $ 0.695 | $ 0.630 |
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- Definition Cash received from a settlement agreement related to a gain contingency No definition available.
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- Definition Operations. No definition available.
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- Definition Regulated energy cost of sales No definition available.
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- Definition Unregulated energy and other cost of sales No definition available.
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Costs incurred and are directly related to generating maintenance revenues. Also includes cost of maintenance on client contracts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No definition available.
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- References No definition available.
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The total amount of regulated operating revenues recognized during the period. No definition available.
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Amount of tax expense classified as other. No definition available.
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- Definition The amount of unregulated operating revenues recognized during the period. No definition available.
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Statement of Comprehensive Income [Abstract] | ||||
| Net Income | $ 6,387 | $ 6,046 | $ 33,241 | $ 25,190 |
| Other Comprehensive Income (Loss), net of tax: | ||||
| Amortization of prior service cost, net of tax of $(5), $(8), $(11) and $(16), respectively | (14) | (12) | (28) | (23) |
| Net gain, net of tax of $41, $69, $80 and $145, respectively | 108 | 101 | 217 | 194 |
| Cash Flow Hedges, net of tax: | ||||
| Unrealized gain (loss) on commodity contract cash flow hedges, net of tax of $429, $(554), $(327) and $(362), respectively | 1,061 | (875) | (728) | (537) |
| Total Other Comprehensive Income (Loss), net of tax | 1,155 | (786) | (539) | (366) |
| Comprehensive Income | $ 7,542 | $ 5,260 | $ 32,702 | $ 24,824 |
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- Definition Commodity Contract Cash Flow Hedges [Abstract] No definition available.
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Statement of Comprehensive Income [Abstract] | ||||
| Amortization of prior service cost, tax | $ (5) | $ (8) | $ (11) | $ (16) |
| Net gain, tax | 41 | 69 | 80 | 145 |
| Unrealized (loss)/gain on commodity contract cash flow hedges, tax | $ 429 | $ (554) | $ (327) | $ (362) |
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- Definition Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Accrued revenue. No definition available.
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- Definition Total deferred charges and other assets No definition available.
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- Definition Deferred Charges and Other Assets. No definition available.
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- Definition Receivables and other deferred charges No definition available.
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- Definition Unregulated energy. No definition available.
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument. No definition available.
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The value of a trust established to hold the stock of an employee compensation and benefits plan as of the balance sheet date. No definition available.
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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The current portion of aggregate prepayments received from customers for goods or services to be provided in the future, as well as the current portion of money or property received from customers that are to be returned upon satisfactory contract completion or as partial prepayment for goods or services to be provided in the future. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total carrying amount as of the balance sheet date of unearned revenue or income, not otherwise specified in the taxonomy, which is expected to be taken into income in future periods and obligations not separately disclosed in the balance sheet (other liabilities). No definition available.
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- References No definition available.
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying amount as of the balance sheet date of product derived from petroleum during the processing of oil or natural gas which is then used as a heat source or fuel. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of current assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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| X | ||||||||||
- Definition Amount before accumulated depreciation, depletion and amortization of other physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Period end amount of total gross PPE. No definition available.
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Allowance for uncollectible accounts | $ 1,076 | $ 936 |
| Common stock, par value (in dollars per share) | $ 0.4867 | $ 0.4867 |
| Common stock, shares authorized (shares) | 50,000,000 | 50,000,000 |
| Preferred Stock, Shares Authorized | 2,000,000 | 2,000,000 |
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |
| Preferred Stock, Shares Issued | 0 | 0 |
| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Operating Activities | ||
| Net Income | $ 33,241 | $ 25,190 |
| Adjustments to reconcile net income to net cash provided by operating activities: | ||
| Depreciation and amortization | 19,543 | 17,906 |
| Depreciation and accretion included in other costs | 4,428 | 3,939 |
| Deferred income taxes | 7,668 | 12,034 |
| Realized loss on commodity contracts/sale of assets/investments | 3,857 | 2,223 |
| Unrealized (gain) loss on investments/commodity contracts | (114) | 184 |
| Employee benefits and compensation | 456 | 819 |
| Share-based compensation | 2,247 | 812 |
| Other, net | (23) | (17) |
| Changes in assets and liabilities: | ||
| Accounts receivable and accrued revenue | 32,230 | 26,862 |
| Propane inventory, storage gas and other inventory | 9,844 | (2,543) |
| Regulatory assets/liabilities, net | 11,035 | 4,255 |
| Prepaid expenses and other current assets | 11,523 | 2,129 |
| Accounts payable and other accrued liabilities | (26,152) | (280) |
| Income taxes receivable | 8,358 | 8,500 |
| Customer deposits and refunds | (2,733) | 1,487 |
| Accrued compensation | (5,196) | (3,876) |
| Other assets and liabilities, net | (1,860) | (3,254) |
| Net cash provided by operating activities | 108,352 | 96,370 |
| Investing Activities | ||
| Property, plant and equipment expenditures | (126,811) | (88,627) |
| Proceeds from sales of assets | 323 | 185 |
| Environmental expenditures | (173) | (135) |
| Net cash used in investing activities | (126,661) | (88,577) |
| Financing Activities | ||
| Common stock dividends | (10,301) | (9,636) |
| (Purchase) issuance of stock under the Dividend Reinvestment Plan | (328) | 421 |
| Tax Withholding payments related to net settled stock compensation | (1,210) | (692) |
| Change in cash overdrafts due to outstanding checks | 632 | (2,370) |
| Net repayment under line of credit agreements and short-term borrowing under the Revolver | (16,313) | (61,910) |
| Proceeds from issuance of long-term debt | 74,916 | 69,800 |
| Repayment of long-term debt, long-term borrowing under the Revolver and capital lease obligation | (30,189) | (5,165) |
| Net cash provided (used) in financing activities | 17,207 | (9,552) |
| Net Decrease in Cash and Cash Equivalents | (1,102) | (1,759) |
| Cash and Cash Equivalents—Beginning of Period | 5,614 | 4,178 |
| Cash and Cash Equivalents—End of Period | $ 4,512 | $ 2,419 |
| X | ||||||||||
- Definition Depreciation and accretion included in other costs No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cost (reversal of cost) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits. No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the period in the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the aggregate amount of obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The change in cash during the period due to the net increase or decrease in outstanding checks, the liability that represents checks that have been issued but that have not cleared. The entity may classify these cash flows as financing or operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in prepaid expenses, and assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The increase (decrease) during the reporting period in the value of assets that are created when regulatory agencies permits public utilities to defer costs (revenues) to the balance sheet. This element is a the increase (decrease) of regulatory assets and liabilities combined. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Cash outflows made during the period for environmental remediation activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The net cash inflow or outflow resulting from the entity's share transaction. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell mineral resources, energy, and agricultural products at some future point held at each balance sheet date, that was included in earnings for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands |
Total |
Common Stock [Member] |
Additional Paid-In Capital [Member] |
Retained Earnings [Member] |
Accumulated Other Comprehensive Loss [Member] |
Deferred Compensation [Member] |
Treasury Stock [Member] |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Beginning Balances (shares) at Dec. 31, 2016 | [1] | 16,303,499 | |||||||||||||||
| Beginning Balances at Dec. 31, 2016 | $ 446,086 | [1] | $ 7,935 | $ 250,967 | $ 192,062 | $ (4,878) | $ 2,416 | $ (2,416) | |||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||
| Net Income | 58,124 | 58,124 | |||||||||||||||
| Other comprehensive income (loss) | 606 | 606 | |||||||||||||||
| Dividend declared | (21,045) | (21,045) | |||||||||||||||
| Retirement savings plan and dividend reinvestment plan (shares) | 10,771 | ||||||||||||||||
| Dividend reinvestment plan | 735 | $ 5 | 730 | ||||||||||||||
| Stock issuance, shares | 0 | ||||||||||||||||
| Stock issuance | (10) | $ 0 | (10) | ||||||||||||||
| Share-based compensation (shares) | [2],[3] | 30,172 | |||||||||||||||
| Share-based compensation and tax benefit | [2],[3] | 1,798 | $ 15 | 1,783 | |||||||||||||
| Treasury stock activities | 0 | 979 | (979) | ||||||||||||||
| Ending Balances (shares) at Dec. 31, 2017 | [1],[4] | 16,344,442 | |||||||||||||||
| Ending Balances at Dec. 31, 2017 | $ 486,294 | [4] | $ 7,955 | 253,470 | 229,141 | (4,272) | 3,395 | (3,395) | |||||||||
| Preferred Stock, Shares Authorized | 2,000,000 | ||||||||||||||||
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | ||||||||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||
| Net Income | $ 33,241 | 33,241 | |||||||||||||||
| Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | (907) | 907 | (907) | ||||||||||||||
| Other comprehensive income (loss) | (539) | (539) | |||||||||||||||
| Dividend declared | (11,414) | (11,414) | |||||||||||||||
| Stock Issued During Period, Shares, Dividend Reinvestment Plan | 0 | ||||||||||||||||
| Stock Issued During Period, Value, Dividend Reinvestment Plan | (2) | $ 0 | (2) | ||||||||||||||
| Share-based compensation (shares) | [2],[3] | 34,103 | |||||||||||||||
| Share-based compensation and tax benefit | [2],[3] | 1,904 | $ 16 | 1,888 | |||||||||||||
| Treasury stock activities | 0 | 387 | (387) | ||||||||||||||
| Ending Balances (shares) at Jun. 30, 2018 | [1],[4] | 16,378,545 | |||||||||||||||
| Ending Balances at Jun. 30, 2018 | $ 507,986 | [4] | $ 7,971 | $ 255,356 | 250,377 | $ (5,718) | $ 3,782 | $ (3,782) | |||||||||
| Preferred Stock, Shares Authorized | 2,000,000 | ||||||||||||||||
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | ||||||||||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | |||||||||||||||||
| Cumulative Effect of New Accounting Principle in Period of Adoption | $ (1,498) | $ (1,498) | |||||||||||||||
| |||||||||||||||||
| X | ||||||||||
- Definition Stock Issued During The Period Shares Retirement Savings Plan And Dividend Reinvestment Plan No definition available.
|
| X | ||||||||||
- Definition Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan No definition available.
|
| X | ||||||||||
- Definition Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect No definition available.
|
| X | ||||||||||
- Definition Treasury Stock Activity And Deferred Compensation Plan Activity During Period Value No definition available.
|
| X | ||||||||||
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. No definition available.
|
| X | ||||||||||
- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Value of stock issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended |
|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2018 |
Dec. 31, 2017 |
|
| Statement of Stockholders' Equity [Abstract] | |||
| Dividend declared (in dollars per share) | $ 0.370 | $ 0.695 | $ 1.2800 |
| Deferred compensation plan held Rabbi Trust (shares) | 96,204 | 96,204 | 90,961 |
| Preferred Stock, Shares Authorized | 2,000,000 | 2,000,000 | 2,000,000 |
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01 |
| Proceeds from Issuance of Common Stock | $ (10) | ||
| Shares issued under the performance incentive plan withheld for employee taxes (shares) | 16,918 | 10,269 |
| X | ||||||||||
- Definition Deferred compensation plan held Rabbi Trust. No definition available.
|
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. No definition available.
|
| X | ||||||||||
- References No definition available.
|
Summary of Accounting Policies |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Accounting Policies | Summary of Accounting Policies Basis of Presentation References in this document to the “Company,” “Chesapeake Utilities,” “we,” “us” and “our” are intended to mean Chesapeake Utilities Corporation, its divisions and/or its subsidiaries, as appropriate in the context of the disclosure. The accompanying unaudited condensed consolidated financial statements have been prepared in compliance with the rules and regulations of the SEC and GAAP. In accordance with these rules and regulations, certain information and disclosures normally required for audited financial statements have been condensed or omitted. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto, included in our latest Annual Report on Form 10-K for the year ended December 31, 2017. In the opinion of management, these financial statements reflect normal recurring adjustments that are necessary for a fair presentation of our results of operations, financial position and cash flows for the interim periods presented. Due to the seasonality of our business, results for interim periods are not necessarily indicative of results for the entire fiscal year. Revenue and earnings are typically greater during the first and fourth quarters, when consumption of energy is highest due to colder temperatures. ARM, Chipola and Central Gas Asset Acquisitions In August 2017, PESCO acquired certain natural gas marketing assets of ARM. The acquired assets complement PESCO’s existing asset portfolio and expanded our regional footprint and retail demand in a market where we had existing pipeline capacity and wholesale liquidity. We accounted for the purchase of these assets as a business combination and initially recorded goodwill of $6.8 million, within our Unregulated Energy segment. In connection with the acquisition, we initially recorded a contingent consideration liability of $2.5 million, based on the acquired business achieving a gross margin target in 2018. During the second quarter of 2018, we identified certain known information as of the acquisition date that was not considered in our original assessment and would have resulted in no contingent consideration liability being initially recorded. Therefore, we reversed the originally-recorded contingent liability and reduced goodwill by $2.5 million. We have similarly revised the condensed consolidated balance sheet as of December 31, 2017. These revisions are considered immaterial to our condensed consolidated financial statements. The contingent liability will be re-evaluated each reporting period in 2018. However, our current assessment is that no contingent consideration will be paid. In August 2017, Flo-gas acquired certain operating assets of Chipola, which provides propane distribution service to approximately 800 residential and commercial customers in Bay, Calhoun, Gadsden, Jackson, Liberty, and Washington Counties, Florida. In December 2017, Flo-gas acquired certain operating assets of Central Gas, which provides propane distribution service to approximately 325 residential and commercial customers in Glades, Highlands, Martin, Okeechobee, and St. Lucie Counties, Florida. The revenue and net income from these acquisitions that were included in our condensed consolidated statements of income for the three and six months ended June 30, 2018, were not material. The amounts recorded in conjunction with our acquisitions are preliminary and subject to adjustment based on additional valuations performed during the measurement period. FASB Statements and Other Authoritative Pronouncements Recently Adopted Accounting Standards Revenue from Contracts with Customers (ASC 606) - On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers, and all the related amendments using the modified retrospective method. We recognized the cumulative effect of initially applying the new revenue standard to all of our contracts as an adjustment to the beginning balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We expect the impact of the adoption of the new revenue standard to be immaterial to our net income on an ongoing basis. This standard requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. The guidance also requires a number of disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows. See Note 3, Revenue Recognition, for additional information. The following highlights the impact of the adoption of ASC 606 on our condensed consolidated income statements for the three and six months ended June 30, 2018 and condensed consolidated balance sheet as of June 30, 2018:
The primary impact of the adoption of ASC 606 on our income statement was the delayed recognition of approximately $204,000 in revenue in the first six months of 2018 to future years and a cumulative adjustment that decreased retained earnings and other assets by $1.6 million at June 30, 2018, associated with a long-term firm transmission contract with an industrial customer. Compensation-Retirement Benefits (ASC 715) - In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post Retirement Benefit Cost. Under this guidance, employers are required to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The update allows for capitalization of the service cost component when applicable. We adopted ASU 2017-07 on January 1, 2018 and applied the changes in the presentation of the service cost and other components of net benefit costs, retrospectively. Aside from changes in presentation, implementation of this standard did not have a material impact on our financial position or results of operations. Statement of Cash Flows (ASC 230) - In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which clarifies how certain transactions are classified in the statement of cash flows. We adopted ASU 2016-15 on January 1, 2018. Implementation of this new standard did not have a material impact on our condensed consolidated statement of cash flows. Compensation - Stock Compensation (ASC 718) - In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting, to clarify when to account for a change in the terms or conditions of a share-based payment award as a modification. Under this guidance, modification accounting is required only if the fair value, the vesting conditions or the award classification (equity or liability) changes because of a change in the terms or conditions of the award. We adopted ASU 2017-09, prospectively, on January 1, 2018. Implementation of this new standard did not have a material impact on our financial position or results of operations. Income Statement - Reporting Comprehensive Income (ASC 220) - In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the TCJA. We adopted ASU 2018-02 on January 1, 2018 and reclassified stranded tax effects from accumulated other comprehensive loss related to our employee benefit plans and commodity contract cash flows hedges. Implementation of this new standard did not have a material impact on our financial position and results of operations. See Note 8, Stockholders' Equity, for additional information. Recent Accounting Standards Yet to be Adopted Leases (ASC 842) - In February 2016, the FASB issued ASU 2016-02, Leases, which provides updated guidance regarding accounting for leases. This update requires a lessee to recognize a lease liability and a lease asset for all leases, including operating leases, with a term greater than 12 months on its balance sheet. The update also expands the required quantitative and qualitative disclosures surrounding leases. ASU 2016-02 will be effective for our annual and interim financial statements beginning January 1, 2019, although early adoption is permitted. The FASB allows companies to elect several practical expedients, in order to simplify the transition to the new standard. The following three expedients must all be elected together:
•An entity need not reassess initial direct costs for any existing leases. Other practical expedients that can be elected individually are:
We expect to use the practical expedients to assist in implementation of this standard. We have assessed all of our leases and have concluded that we may have some operating leases that qualify for the short-term lease exception. Upon adoption, we will record the right-of-use assets and the lease liabilities related to our operating leases with a lease term in excess of one year. We do not believe that this will have a material impact on our financial position, results of operations or cash flows. In January 2018, the FASB issued ASU 2018-01, Land Easement Practical Expedient for Transition to Topic 842, which provides a practical expedient under Topic 842 to not evaluate existing or expired land easements that were not previously accounted for as leases. We plan to utilize the provided practical expedient for existing and expired land easements and will assess all new or modified land easements and right-of-way agreements, under the guidance of ASU 2016-02, following its adoption. Intangibles-Goodwill (ASC 350) - In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment, which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. ASU 2017-04 will be effective for our annual and interim financial statements beginning January 1, 2020, although early adoption is permitted. The amendments included in this ASU are to be applied prospectively. We believe that implementation of this new standard will not have a material impact on our financial position or results of operations. Derivatives and Hedging (ASC 815) - In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. Among other changes to hedge designation, ASU 2017-12 expands the risks that can be designated as hedged risks in cash flow hedges to include cash flow variability from contractually specified components of forecasted purchases or sales of non-financial assets. ASU 2017-12 requires the entire change in fair value of a hedging instrument included in the assessment of hedge effectiveness to be presented in the same income statement line that is used to present the earnings effects of the hedged item for fair value hedges and in other comprehensive income for cash flow hedges. For disclosures, ASU 2017-12 requires a tabular presentation of the income statement effect of fair value and cash flow hedges, and it eliminates the requirement to disclose the ineffective portion of the change in fair value of hedging instruments. ASU 2017-12 will be effective for our annual and interim financial statements beginning January 1, 2019, although early adoption is permitted. We intend to adopt the updated hedge accounting standard in 2018, which we expect will reduce the MTM volatility in PESCO’s results due to better alignment of risk management activities and financial reporting, risk component hedging and certain other simplifications of hedge accounting guidance. Compensation - Stock Compensation (ASC 718) - In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting, which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 will be effective for our annual and interim financial statements beginning January 1, 2019, although early adoption is permitted. We believe that implementation of this new standard will not have a material impact on our financial position or results of operations. |
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- Definition The entire disclosure for all significant accounting policies of the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Calculation of Earnings Per Share |
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| Earnings Per Share [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Calculation of Earnings Per Share | Calculation of Earnings Per Share
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- Definition The entire disclosure for earnings per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Revenue Recognition (Notes) |
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| Revenue from Contract with Customer [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Revenue from Contract with Customer [Text Block] | 3. Revenue Recognition We recognize revenue when our performance obligations under contracts with customers have been satisfied, which generally occurs when our businesses have delivered or transported natural gas, electricity or propane to customers. We exclude sales taxes and other similar taxes from the transaction price. Typically, our customers pay for the goods and/or services we provide in the month following the satisfaction of our performance obligation. The following table displays our revenue by major source based on product and service type for the three months ended June 30, 2018:
(1) Includes other revenue (revenues from sources other than contracts with customers) of $(356,000) and $82,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to weather normalization for Maryland division and Sandpiper and late fees. The following table displays our revenue by major source based on product and service type for the six months ended June 30, 2018:
(1) Includes other revenue (revenues from sources other than contracts with customers) of $(945,000) and $155,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to weather normalization for Maryland division and Sandpiper and late fees. Regulated Energy segment The businesses within our Regulated Energy segment are regulated utilities whose operations and customer contracts are subject to rates approved by the state PSC or the FERC. Our energy distribution operations deliver natural gas or electricity to customers and we bill the customers for both the delivery of natural gas or electricity and the related commodity, where applicable. In most jurisdictions, our customers are also required to purchase the commodity from us, although certain customers in some jurisdictions may purchase the commodity from a third-party retailer (in which case we provide delivery service only). We consider the delivery of natural gas or electricity and/or the related commodity sale as one performance obligation because the commodity and its delivery are highly interrelated with two-way dependency on one another. Our performance obligation is satisfied over time as natural gas or electricity is delivered and consumed by the customer. We recognize revenues based on monthly meter readings, which are based on the quantity of natural gas or electricity used and the approved rates. We accrue unbilled revenues for natural gas and electricity that have been delivered, but not yet billed, at the end of an accounting period to the extent that billing and delivery do not coincide. Revenues for Eastern Shore are based on rates approved by the FERC. The FERC has also authorized Eastern Shore to negotiate rates above or below the FERC-approved maximum rates, which customers can elect as an alternative to the FERC-approved maximum rates. Eastern Shore's services can be firm or interruptible. Firm services are offered on a guaranteed basis and are available at all times unless prevented by force majeure or other permitted curtailments. Interruptible customers receive service only when there is available capacity or supply. Our performance obligation is satisfied over time as we deliver natural gas to the customers' locations. We recognize revenues based on meter readings at the end of the month, which are based on capacity used or reserved and the fixed monthly charge. Peninsula Pipeline is engaged in natural gas intrastate transmission to third-party customers and certain affiliates in the State of Florida. Our performance obligation is satisfied over time as the natural gas is transported to customers. We recognize revenue based on rates approved by the Florida PSC and the capacity used or reserved. Since we bill customers at the end of each month, we do not have any unbilled revenue. Unregulated Energy segment Revenues generated from the Unregulated Energy segment are not subject to any federal, state, or local pricing regulations. Aspire Energy primarily sources gas from hundreds of conventional producers and performs gathering and processing functions to maintain the quality and reliability of its gas for its wholesale customers. Aspire Energy's performance obligation is satisfied over time as natural gas is delivered to its customers. Aspire Energy recognizes revenue based on the deliveries of natural gas at contractually agreed upon rates (which are based upon an established monthly index price and a monthly operating fee, as applicable). For natural gas customers, we accrue unbilled revenues for natural gas that has been delivered, but not yet billed, at the end of an accounting period to the extent that billing and delivery do not coincide with the end of the accounting period. Eight Flags' CHP plant, which is located on land leased from Rayonier, produces three sources of energy: electricity, steam and heated water. Rayonier purchases the steam (unfired and fired) and heated water, which is used in Rayonier’s production facility. Our electric distribution operation purchases the electricity generated by the CHP plant for distribution to its customers. Eight Flags' performance obligation is satisfied over time as deliveries of heated water, steam and electricity occur. Eight Flags recognizes revenues over time based on the amount of heated water, steam and electricity generated and delivered to its customers. For our propane delivery operations, we recognize revenue based upon customer type and service offered. Generally, for propane bulk delivery customers (customers without meters) and wholesale sales, our performance obligation is satisfied when we deliver propane to the customers' locations (point-in-time basis). We recognize revenue from these customers based on the number of gallons delivered and the price per gallon at the point-in-time of delivery. For our propane delivery customers with meters, we satisfy our performance obligation over time when we deliver propane to customers. We recognize revenue over time based on the amount of propane consumed and the applicable price per unit. For propane delivery metered customers, we accrue unbilled revenues for propane that has been delivered, but not yet billed, at the end of an accounting period to the extent that billing and delivery do not coincide with the end of the accounting period. PESCO provides natural gas supply and asset management services to customers (including affiliates of Chesapeake Utilities) located primarily in Florida, the Delmarva Peninsula, and the Appalachian Basin. PESCO's performance obligation is satisfied over time as natural gas is delivered to its customers. PESCO recognizes revenue over time based on customer meter readings, on a monthly basis. We accrue unbilled revenues for natural gas that has been delivered, but not yet billed, at the end of an accounting period to the extent that billing and delivery do not coincide with the end of the accounting period. Contract balances The timing of revenue recognition, customer billings and cash collections results in trade receivables, unbilled receivables (contract assets), and customer advances (contract liabilities) in our consolidated balance sheets. The opening and closing balances of our trade receivables, contract assets, and contract liabilities are as follows:
Our trade receivables are included in trade and other receivables in the condensed consolidated balance sheets. Our non-current contract assets are included in other assets in the condensed consolidated balance sheet and relate to operations and maintenance costs incurred by Eight Flags that have not yet been recovered through rates for the sale of electricity to our electric distribution operation pursuant to a long-term service agreement. At times, we receive advances or deposits from our customers before we satisfy our performance obligation, resulting in contract liabilities. At June 30, 2018 and December 31, 2017, we had a contract liability, which was included in other accrued liabilities in the condensed consolidated balance sheet, of $175,000 and $407,000, respectively, and which relates to non-refundable prepaid fixed fees for our Delmarva Peninsula propane delivery operation's retail offerings. Our performance obligation is satisfied over the term of the respective retail offering plan on a ratable basis. For the three and six months ended June 30, 2018, we recognized revenue of $84,000 and $336,000, respectively. Practical expedients For our businesses with agreements that contain variable consideration, we use the invoice practical expedient method. We determined that the amounts invoiced to customers correspond directly with the value to our customers and our performance to date. For our long-term contracts, the revenue we recognize corresponds directly to the amount we have the right to invoice, which corresponds directly to our performance obligation. Our performance obligations under our long-term contracts are satisfied over time. As a practical expedient, we do not disclose information about remaining, or unsatisfied, performance obligations for these long-term contracts since the revenue recognized corresponds to the amount we have the right to invoice. |
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- References No definition available.
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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Rates and Other Regulatory Activities |
6 Months Ended |
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Jun. 30, 2018 | |
| Regulated Operations [Abstract] | |
| Rates and Other Regulatory Activities | Rates and Other Regulatory Activities Our natural gas and electric distribution operations in Delaware, Maryland and Florida are subject to regulation by their respective PSC; Eastern Shore, our natural gas transmission subsidiary, is subject to regulation by the FERC; and Peninsula Pipeline, our intrastate pipeline subsidiary, is subject to regulation by the Florida PSC. Chesapeake Utilities' Florida natural gas distribution division and FPU’s natural gas and electric distribution operations continue to be subject to regulation, as separate entities, by the Florida PSC. Delaware Effect of the TCJA on rate payers: As a result of the enactment of the TCJA, the Delaware PSC issued an order requiring all rate-regulated utilities to file estimates of the impact of the TCJA on their cost of service for the most recent test year available (including new rate schedules). The order also required utilities to propose procedures for changing rates to reflect those impacts on or before March 31, 2018. Our Delaware Division filed the requisite reports with the Delaware PSC on March 30, 2018. Subsequently, the Delaware Division filed an updated report reflecting the impact of the TCJA on May 31, 2018. If, after reviewing the required filing, the Delaware PSC determines to reduce our rates, it will open a new docket and establish a procedural schedule for conducting an evidentiary hearing regarding the impacts of the TCJA on our operations and existing rates. In addition, on February 1, 2018, the Delaware PSC issued an order requiring Delaware rate-regulated public utilities to accrue regulatory liabilities reflecting the jurisdictional revenue requirement impacts of changes in the federal corporate income tax laws. In compliance with this order, we have established a regulatory liability to reflect the estimated impacts of the changes in the federal corporate income tax rate. We believe that the ultimate impact of the TCJA on rates charged by our Delaware Division will not have a material effect on our financial position or results of operations. Underserved Area Rates: In December 2017, we filed an application for approval of natural gas expansion service offerings. We requested authorization to utilize existing expansion area tariff rates to serve customers located outside of the current Sussex County, Delaware expansion area boundaries that cannot be economically served under the regular tariff rates. In June 2018, we reached a settlement agreement with the relevant parties, which allows us to utilize higher rates for areas outside of our existing expansion area. The settlement agreement was presented before the Delaware PSC at its public meeting on July 10, 2018, where it was unanimously passed. CGS: In June 2018, we filed with the Delaware PSC an application requesting approval of the acquisition and subsequent conversion of propane CGS to natural gas located within our territory. We requested the establishment of regulatory accounting treatment and valuation of the acquisition of certain CGS, approval of a methodology to set new distribution rates for CGS customers and approval of a new system-wide tariff rate that will recover CGS conversion costs. The Delaware PSC has not reached a decision as of the date of this filing. Maryland Division and Sandpiper Effect of the TCJA on rate payers: The Maryland PSC issued an order requiring all Maryland public utilities whose rates are explicitly grossed-up for income taxes to track the impacts of the TCJA beginning January 1, 2018. The order required utilities to: (a) apply regulatory accounting treatment, which includes the use of regulatory assets and liabilities, for all impacts of the TCJA; (b) file an explanation of the expected effects of the TCJA on their expenses and revenues; and (c) explain when and how they expect to pass on to their customers the net results of those effects. We established a regulatory liability to reflect the impacts of the changes in the federal corporate income tax rate in compliance with the Maryland PSC’s order. In addition, our Maryland Division and Sandpiper made compliance filings that included preliminary estimates of the annual impact of the change in the statutory federal income tax rate from 35 percent to 21 percent. In April 2018, the Maryland PSC ordered both the Maryland Division and Sandpiper to implement reduced rates effective May 1, 2018 reflecting the impact of the TCJA. We implemented a one-time bill credit for the regulatory liability established for the refunds and issued the refunds to customers in June. We must also submit an informational filing to the Maryland PSC within 60 days of the refund payment date. Additionally, pursuant to the Maryland PSC’s order, if in the future the Maryland Division or Sandpiper identify any additional tax savings, we must submit an additional filing to the Maryland PSC in order to return those savings to customers as soon as possible. We believe that the ultimate impact of the TCJA on rates charged by our Maryland Division and Sandpiper will not have a material effect on our financial position or results of operations. Florida Florida Electric Reliability/Modernization Pilot Program: In July 2017, FPU’s electric division filed a petition with the Florida PSC requesting approval to include $15.2 million of certain capital project expenditures in its rate base and to adjust its base rates accordingly. These expenditures are designed to improve the stability and safety of the electric system, while enhancing the capability of FPU’s electrical grid. An interconnection project with FPL, which enables FPU to mitigate fuel costs for its electric customers, was included in the $15.2 million capital project expenditures. In December 2017, the Florida PSC approved this petition, effective January 1, 2018. The settlement agreement prescribed the methodology for adjusting the new rates based on the lower federal income tax rate and the process and methodology regarding the refund of deferred income taxes, reclassified as a regulatory liability, as a result of the TCJA. We have established a regulatory liability to reflect the impacts of the changes in the federal corporate income tax rate in compliance with the settlement agreement. Electric Limited Proceeding-Storm Recovery: In February 2018, FPU’s electric division filed a petition with the Florida PSC, requesting recovery of incremental storm restoration costs related to several hurricanes and tropical storms, along with the replenishment of FPU’s storm reserve to its pre-storm level of $1.5 million. As a result of these hurricanes and tropical storms, FPU’s storm reserve was depleted and is currently at a deficit of $779,000. FPU is requesting approval of a surcharge of $1.82 per kilowatt per hour for two years to recover and replenish storm-related costs. At this time, no date for approval of this petition has been scheduled by the Florida PSC. Effect of the TCJA on ratepayers: The Office of Public Counsel filed a petition requesting that the Florida PSC establish a general docket to investigate and adjust rates for all investor-owned utilities related to the passage of the TCJA. The Florida PSC issued a Memorandum with a recommendation that, if utilities do not agree to a January 1, 2018 effective date, then the effective date should be February 6, 2018. On January 30, 2018, the Florida PSC scheduled informal meetings between its staff and interested persons to discuss the impact of the TCJA. Hearings for Florida’s electric utilities are tentatively scheduled for the first quarter of 2019 and hearings for the natural gas utilities are tentatively scheduled for the fourth quarter of 2018. In December 2017, the Florida PSC issued an order regarding the limited proceeding for FPU's electric division, which prescribes the applicability, timing and treatment of the implications of the TCJA, as discussed above. In June, each of our Florida natural gas operations filed a petition and testimony in support of the disposition of the impacts created by the TCJA. We believe that the ultimate impact of the TCJA on rates charged by FPU's electric division and our Florida natural gas operations will not have a material effect on our financial position or results of operations. Eastern Shore 2017 Expansion Project: In May 2016, the FERC approved Eastern Shore's request to initiate the pre-filing review process for its 2017 Expansion Project. The 2017 Expansion Project's facilities include approximately 23 miles of pipeline looping in Pennsylvania, Maryland and Delaware; upgrades to existing metering facilities in Lancaster County, Pennsylvania; installation of an additional compressor unit at Eastern Shore’s existing Daleville compressor station in Chester County, Pennsylvania; and approximately 17 miles of new mainline extension and two pressure control stations in Sussex County, Delaware. Eastern Shore entered into precedent agreements with seven existing customers, including three affiliates of Chesapeake Utilities, for a total of 61,162 Dts/d of additional firm natural gas transportation service on Eastern Shore’s pipeline system with an additional 52,500 Dts/d of firm transportation service at certain Eastern Shore receipt facilities. In October 2017, the FERC issued a CP authorizing Eastern Shore to construct the expansion facilities. The estimated cost of the 2017 Expansion Project is approximately $117.0 million. Eastern Shore submitted its Implementation Plan in October 2017, addressing the actions Eastern Shore will undertake to meet the environmental conditions set forth in the FERC's order. In December 2017, the TETLP interconnect upgrade was placed into service. In June 2018, the Fair Hill Loop in Chester County, Pennsylvania and Cecil County, Maryland was placed into service. With the exception of some minor facilities, the remaining segments of the 2017 Expansion Project are expected to be placed into service in various phases during the remainder of 2018. 2017 Rate Case Filing: In January 2017, Eastern Shore filed a base rate proceeding with the FERC, as required by the terms of its 2012 rate case settlement agreement. Eastern Shore based its proposed rates on the mainline cost of service of approximately $60.0 million resulting in an overall requested revenue increase of approximately $18.9 million and a requested rate of return on common equity of 13.75 percent. In March 2017, the FERC issued an order suspending the tariff rates for the usual five-month period. In August 2017, Eastern Shore implemented new rates, subject to refund, based on the outcome of the rate proceeding. Eastern Shore recorded incremental revenue of approximately $3.7 million for the year ended December 31, 2017, and established a regulatory liability to reserve a portion of the total incremental revenues generated by the new rates until the rate case settlement is approved by the FERC and customers receive refunds according to the terms of the settlement agreement. Eastern Shore filed an uncontested settlement agreement and a motion to place interim settlement rates into effect beginning on January 1, 2018. The FERC approved the settlement agreement in February 2018, and it became final in March 2018. Exclusive of the TCJA impact, base rates would have increased, on an annual basis, by approximately $9.8 million. Effect of the TCJA on ratepayers: In March 2018, Eastern Shore filed with the FERC its revised base rates, reflecting the change in its federal corporate income tax rate. These adjusted base rates became effective April 1, 2018 and will generate approximately $6.6 million, on an annual basis. Any excess accumulated deferred income tax balances will flow back to customers over the period determined in the next rate case, absent any transition rule included in the TCJA or other statutes or rules that would govern the flow-back period. In April 2018, Eastern Shore refunded to its customers, with interest, the difference between the proposed rates and the settlement rates. The refund to customers also reflected the difference in rates due to the impact of the TCJA. In March 2018, the FERC issued a Notice of Proposed Rulemaking that proposed a process to determine which jurisdictional natural gas pipelines may be collecting unjust and unreasonable rates in light of the recent reduction in the corporate income tax rate in the TCJA and changes to the FERC’s income tax allowance policies following the United Airlines, Inc. v. FERC decision. The Notice of Proposed Rulemaking proposed requiring interstate natural gas pipelines to provide an informational filing to allow the FERC to evaluate the impact of the TCJA on the pipelines’ revenue requirement. In April 2018, Eastern Shore filed comments in this proceeding requesting confirmation that Eastern Shore is not required to provide an informational filing because it has already implemented lower rates in accordance with the settlement agreement in its 2017 rate case approved by the FERC. In July 2018, the FERC issued a final rule, which largely adopted the process proposed in the Notice of Proposed Rulemaking requiring all interstate natural gas companies to file an informational filing for the purpose of evaluating the impact of the TCJA and the United Airlines, Inc. v. FERC decision on interstate natural gas pipelines’ revenue requirements. The final rule provides that an individual pipeline has the option to request a waiver if the pre-March 2018 settlement justifies not adjusting its rates at this time. We plan to file such a request. We believe that the ultimate resolution of this matter will not have a material effect on Eastern Shore’s financial position or results of operations. |
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- Definition The entire disclosure for public utilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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Environmental Commitments and Contingencies |
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| Environmental Remediation Obligations [Abstract] | |||||||||||||||||||||||||||||||||||||||||
| Environmental Commitments and Contingencies | Environmental Commitments and Contingencies We are subject to federal, state and local laws and regulations governing environmental quality and pollution control. These laws and regulations require us to remove or remediate, at current and former operating sites, the effect on the environment of the disposal or release of specified substances. MGP Sites We have participated in the investigation, assessment or remediation of, and have exposures at, seven former MGP sites. Those sites are located in Salisbury, Maryland; Seaford, Delaware; and Winter Haven, Key West, Pensacola, Sanford and West Palm Beach, Florida. We have also been in discussions with the MDE regarding another former MGP site located in Cambridge, Maryland. As of June 30, 2018, we had approximately $9.5 million in environmental liabilities related to FPU’s MGP sites in Key West, Pensacola, Sanford and West Palm Beach, Florida. FPU has approval to recover, from insurance and from customers through rates, up to $14.0 million of its environmental costs related to its MGP sites. Approximately $11.3 million has been recovered as of June 30, 2018, leaving approximately $2.7 million in regulatory assets for future recovery of environmental costs from FPU’s customers. Environmental liabilities for our MGP sites are recorded on an undiscounted basis based on the estimate of future costs provided by independent consultants. We continue to expect that all costs related to environmental remediation and related activities, including any potential future remediation costs for which we do not currently have approval for regulatory recovery, will be recoverable from customers through rates. The following is a summary of our remediation status and estimated costs to implement clean-up of our key MGP sites:
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- Definition The entire disclosure for environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. This element may be used for all of an entity's disclosures about environmental loss contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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Other Commitments and Contingencies |
6 Months Ended |
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Jun. 30, 2018 | |
| Commitments and Contingencies Disclosure [Abstract] | |
| Other Commitments and Contingencies | Other Commitments and Contingencies Natural Gas, Electric and Propane Supply We have entered into contractual commitments, with various expiration dates, to purchase natural gas, electricity and propane from various suppliers. In 2017, our Delmarva Peninsula natural gas distribution operations entered into asset management agreements with PESCO to manage their natural gas transportation and storage capacity. The agreements were effective as of April 1, 2017, and each has a three-year term, expiring on March 31, 2020. Previously, the Delaware PSC approved PESCO to serve as an asset manager with respect to our Delaware Division. In May 2013, Sandpiper entered into a capacity, supply and operating agreement with EGWIC to purchase propane over a six-year term ending in May 2019. Sandpiper's current annual commitment is approximately 2.2 million gallons. Sandpiper has the option to enter into either a fixed per-gallon price for some or all of the propane purchases or a market-based price utilizing one of two local propane pricing indices. Also in May 2013, Sharp entered into a separate supply and operating agreement with EGWIC. Under this agreement, Sharp has a commitment to supply propane to EGWIC over a six-year term ending in May 2019. Sharp's current annual commitment is approximately 2.2 million gallons. The agreement between Sharp and EGWIC is separate from the agreement between Sandpiper and EGWIC, and neither agreement permits the parties to set off the rights and obligations specified in one agreement against those specified in the other agreement. Chesapeake Utilities' Florida Division has firm transportation service contracts with FGT and Gulfstream. Pursuant to a capacity release program approved by the Florida PSC, all of the capacity under these agreements has been released to various third parties, including PESCO. Under the terms of these capacity release agreements, Chesapeake Utilities is contingently liable to FGT and Gulfstream should any party that acquired the capacity through release fail to pay the capacity charge. FPU’s electric fuel supply contracts require FPU to maintain an acceptable standard of creditworthiness based on specific financial ratios. FPU’s agreement with FPL requires FPU to meet or exceed a debt service coverage ratio of 1.25 times based on the results of the prior 12 months. If FPU fails to meet this ratio, it must provide an irrevocable letter of credit or pay all amounts outstanding under the agreement within five business days. FPU’s electric fuel supply agreement with Gulf Power requires FPU to meet the following ratios based on the average of the prior six quarters: (a) funds from operations interest coverage ratio (minimum of 2 times), and (b) total debt to total capital (maximum of 65 percent). If FPU fails to meet the requirements, it has to provide the supplier a written explanation of actions taken, or proposed to be taken, to become compliant. Failure to comply with the ratios specified in the Gulf Power agreement could also result in FPU having to provide an irrevocable letter of credit. As of June 30, 2018, FPU was in compliance with all of the requirements of its fuel supply contracts. Eight Flags provides electricity and steam generation services through its CHP plant located on Amelia Island, Florida. In June 2016, Eight Flags began selling power generated from the CHP plant to FPU pursuant to a 20-year power purchase agreement for distribution to its retail electric customers. In July 2016, Eight Flags also started selling steam, pursuant to a separate 20-year contract, to Rayonier, the landowner on which the CHP plant is located. The CHP plant is powered by natural gas transported by FPU through its distribution system and Peninsula Pipeline through its intrastate pipeline. Corporate Guarantees We have issued corporate guarantees to certain vendors of our subsidiaries, primarily PESCO. These corporate guarantees provide for the payment of natural gas purchases in the event that PESCO defaults. PESCO has never defaulted on its obligations to pay its suppliers. The liabilities for these purchases are recorded when incurred. The aggregate amount guaranteed at June 30, 2018 was approximately $72.5 million, with the guarantees expiring on various dates through June 2019. Chesapeake Utilities also guarantees the payment of FPU’s first mortgage bonds. The maximum exposure under this guarantee is the outstanding principal plus accrued interest balances. The outstanding principal balances of FPU’s first mortgage bonds approximate their carrying values (see Note 14, Long-Term Debt, for further details). Letters of Credit As of June 30, 2018, we have issued letters of credit totaling approximately $5.0 million related to the electric transmission services for FPU's electric division, the firm transportation service agreement between TETLP and our Delaware and Maryland divisions, the payment of natural gas purchases for PESCO, and to our current and previous primary insurance carriers. These letters of credit have various expiration dates through December 2019. There have been no draws on these letters of credit as of June 30, 2018. We do not anticipate that the counterparties will draw upon these letters of credit, and we expect that the letters of credit will be renewed to the extent necessary in the future. Other We are involved in certain other legal actions and claims arising in the normal course of business. We are also involved in certain legal and administrative proceedings before various governmental agencies concerning rates. In the opinion of management, the ultimate disposition of these proceedings will not have a material effect on our consolidated financial position, results of operations or cash flows. |
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- References No definition available.
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- Definition The entire disclosure for commitments and contingencies. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| Segment Reporting [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Segment Information | Segment Information We use the management approach to identify operating segments. We organize our business around differences in regulatory environment and/or products or services, and the operating results of each segment are regularly reviewed by the chief operating decision maker (our Chief Executive Officer) in order to make decisions about resources and to assess performance. Our operations are comprised of two reportable segments:
The remainder of our operations is presented as “Other businesses and eliminations”, which consists of unregulated subsidiaries that own real estate leased to Chesapeake Utilities, as well as certain corporate costs not allocated to other operations. The following table presents financial information about our reportable segments:
Our operations are entirely domestic. |
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- References No definition available.
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| X | ||||||||||
- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) | Stockholder's Equity Preferred Stock We had 2,000,000 authorized and unissued shares of preferred stock, $0.01 par value per share, as of June 30, 2018 and December 31, 2017. Shares of preferred stock may be issued from time to time, by authorization of our Board of Directors and without the necessity of further action or authorization by stockholders, in one or more series and with such voting powers, designations, preferences and relative, participating, optional or other special rights and qualifications as the Board of Directors may, in its discretion, determine. Accumulated Other Comprehensive Loss Defined benefit pension and postretirement plan items, unrealized gains (losses) of our propane swap agreements, call options and natural gas futures contracts, designated as commodity contracts cash flow hedges, are the components of our accumulated other comprehensive loss. During the first quarter of 2018, we elected early adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Accordingly, we reclassified stranded tax effects resulting from the TCJA from accumulated other comprehensive loss to retained earnings, related to our employee benefit plans and commodity contracts cash flow hedges. The following tables present the changes in the balance of accumulated other comprehensive (loss)/income as of June 30, 2018 and 2017. All amounts except the stranded tax reclassification are presented net of tax.
The following table presents amounts reclassified out of accumulated other comprehensive loss for the three and six months ended June 30, 2018 and 2017. Deferred gains or losses for our commodity contracts cash flow hedges are recognized in earnings upon settlement.
(1) These amounts are included in the computation of net periodic costs (benefits). See Note 9, Employee Benefit Plans, for additional details. (2) These amounts are included in the effects of gains and losses from derivative instruments. See Note 12, Derivative Instruments, for additional details. Amortization of defined benefit pension and postretirement plan items is included in operations expense, and gains and losses on propane swap agreements, call options and natural gas futures contracts are included in cost of sales in the accompanying consolidated statements of income. The income tax benefit is included in income tax expense in the accompanying consolidated statements of income. |
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| X | ||||||||||
- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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Employee Benefit Plans |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Retirement Benefits [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Employee Benefit Plans | Employee Benefit Plans Net periodic benefit costs for our pension and post-retirement benefits plans for the three and six months ended June 30, 2018 and 2017 are set forth in the following tables:
(1)As a result of our adoption of ASU 2017-07 on January 1, 2018, the "other than service" cost components of net periodic costs have been recorded or reclassified to other income (expense), net in the condensed consolidated statements of income. We expect to record pension and postretirement benefit costs of approximately $913,000 for 2018. Included in these costs is approximately $769,000 related to continued amortization of the FPU pension regulatory asset, which represents the portion attributable to FPU’s regulated energy operations for the changes in funded status that occurred, but were not recognized, as part of net periodic benefit costs prior to the FPU merger in 2009. This was deferred as a regulatory asset by FPU prior to the merger, to be recovered through rates pursuant to a previous order by the Florida PSC. The unamortized balance of this regulatory asset was approximately $942,000 and approximately $1.3 million at June 30, 2018 and December 31, 2017, respectively. Pursuant to a Florida PSC order, FPU continues to record, as a regulatory asset, a portion of the unrecognized pension and postretirement benefit costs related to its regulated operations after the FPU merger. The portion of the unrecognized pension and postretirement benefit costs related to FPU’s unregulated operations and Chesapeake Utilities' operations is recorded to accumulated other comprehensive loss. The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three months ended June 30, 2018 and 2017:
(1) See Note 8, Stockholder's Equity. During the three and six months ended June 30, 2018, we contributed approximately $126,000 and $198,000, respectively, to the Chesapeake Pension Plan and approximately $539,000 and $848,000, respectively, to the FPU Pension Plan. We expect to contribute a total of approximately $359,000 and approximately $1.5 million to the Chesapeake Pension Plan and FPU Pension Plan, respectively, during 2018, which represents the minimum annual contribution payments required. The Chesapeake SERP, the Chesapeake Postretirement Plan and the FPU Medical Plan are unfunded and are expected to be paid out of our general funds. Cash benefits paid under the Chesapeake SERP for the three and six months ended June 30, 2018, were approximately $38,000 and $76,000, respectively. We expect to pay total cash benefits of approximately $151,000 under the Chesapeake SERP in 2018. Cash benefits paid under the Chesapeake Postretirement Plan, primarily for medical claims for the three and six months ended June 30, 2018, were approximately $7,000 and $18,000, respectively. We estimate that approximately $97,000 will be paid for such benefits under the Chesapeake Postretirement Plan in 2018. Cash benefits paid under the FPU Medical Plan, primarily for medical claims for the three and six months ended June 30, 2018, were approximately $13,000 and $24,000, respectively. We estimate that approximately $88,000 will be paid for such benefits under the FPU Medical Plan in 2018. |
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- References No definition available.
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| X | ||||||||||
- Definition The entire disclosure for pension and other postretirement benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Investments |
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| Investments, Debt and Equity Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investments | Investments The investment balances at June 30, 2018 and December 31, 2017, consisted of the following:
We classify these investments as trading securities and report them at their fair value. For the three months ended June 30, 2018 and 2017, we recorded a net unrealized loss of approximately $158,000 and a net unrealized gain of approximately $181,000, respectively, in other expense, net in the condensed consolidated statements of income related to these investments. For the six months ended June 30, 2018 and 2017, we recorded a net unrealized loss of approximately $113,000 and a net unrealized gain of approximately $433,000, respectively, in other expense, net in the condensed consolidated statements of income related to these investments. For the investment in the Rabbi Trust, we also have recorded an associated liability, which is included in other pension and benefit costs in the consolidated balance sheets and is adjusted each period for the gains and losses incurred by the investments in the Rabbi Trust. |
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- References No definition available.
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- Definition The entire disclosure for investments in certain debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Share-Based Compensation |
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share-Based Compensation | Share-Based Compensation Our non-employee directors and key employees are granted share-based awards through our SICP. We record these share-based awards as compensation costs over the respective service period for which services are received in exchange for an award of equity or equity-based compensation. The compensation cost is based primarily on the fair value of the shares awarded, using the estimated fair value of each share on the date it was granted and the number of shares to be issued at the end of the service period. The table below presents the amounts included in net income related to share-based compensation expense for the three and six months ended June 30, 2018 and 2017:
Non-employee Directors Shares granted to non-employee directors are issued in advance of the directors’ service periods and are fully vested as of the grant date. We record a prepaid expense equal to the fair value of the shares issued and amortize the expense equally over a one-year service period. In May 2018, each of our non-employee directors received an annual retainer of 792 shares of common stock under the SICP for service as a director through the 2019 Annual Meeting of Stockholders. The table below presents the summary of the stock activity for awards to non-employee directors for the six months ended June 30, 2018:
At June 30, 2018, there was approximately $450,000 of unrecognized compensation expense related to these awards. This expense will be recognized over the directors' remaining service periods ending April 30, 2019. See Note 1, Summary of Accounting Policies, for additional information regarding ASU 2018-07 and its impact on the accounting for non-employee share-based payments. Key Employees The table below presents the summary of the stock activity for awards to key employees for the six months ended June 30, 2018:
(1)Includes 2,569 shares that were forfeited. In February 2018, our Board of Directors granted awards of 49,494 shares of common stock to key employees under the SICP. The shares granted are multi-year awards that will vest at the end of the three-year service period ending December 31, 2020. All of these stock awards are earned based upon the successful achievement of long-term financial results, which comprise market-based and performance-based conditions or targets. The fair value of each performance-based condition or target is equal to the market price of our common stock on the grant date of each award. For the market-based conditions, we used the Black-Scholes pricing model to estimate the fair value of each market-based award granted. In March 2018, upon the election of certain of our executive officers, we withheld shares with a value at least equivalent to each such executive officer’s minimum statutory obligation for applicable income and other employment taxes related to shares that we awarded for the performance period ended December 31, 2017, remitted the cash to the appropriate taxing authorities, and paid the balance of such awarded shares to each such executive officer. We withheld 10,436 shares, based on the value of the shares on their award date, determined by the average of the high and low prices of our common stock. Total combined payments for the employees’ tax obligations to the taxing authorities were approximately $719,000. In June 2018, the Company and a former executive officer entered into a separation agreement and release (the "Separation Agreement"). Pursuant to the Separation Agreement, three awards, representing a total of 14,107 shares of common stock previously granted to the executive officer under the SICP, immediately vested at the time of separation, and an additional 2,569 shares were forfeited. We settled the awards that vested in cash and recognized $1.1 million as share-based compensation expense. At June 30, 2018, the aggregate intrinsic value of the SICP awards granted to key employees was approximately $10.5 million. At June 30, 2018, there was approximately $3.2 million of unrecognized compensation cost related to these awards, which is expected to be recognized from 2018 through 2020. Stock Options We did not have any stock options outstanding at June 30, 2018 or 2017, nor were any stock options issued during these periods. |
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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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Derivative Instruments |
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Derivative Instruments | Derivative Instruments We use derivative and non-derivative contracts to engage in trading activities and manage risks related to obtaining adequate supplies and the price fluctuations of natural gas, electricity and propane. Our natural gas, electric and propane distribution operations have entered into agreements with suppliers to purchase natural gas, electricity and propane for resale to our customers. Aspire Energy has entered into contracts with producers to secure natural gas to meet its obligations. Purchases under these contracts typically either do not meet the definition of derivatives or are considered “normal purchases and normal sales” and are accounted for on an accrual basis. Our propane distribution and natural gas marketing operations may also enter into fair value hedges of their inventory or cash flow hedges of their future purchase commitments in order to mitigate the impact of wholesale price fluctuations. As of June 30, 2018, our natural gas and electric distribution operations did not have any outstanding derivative contracts. Hedging Activities in 2018 PESCO enters into natural gas futures contracts associated with the purchase and sale of natural gas to specific customers. These contracts are effective through March 2022, and we designate and account for them as cash flow hedges. There is no ineffective portion of these hedges. At June 30, 2018, PESCO had a total of 16.9 million Dts hedged under natural gas futures contracts, with a liability fair value of approximately $779,000. The change in fair value of the natural gas futures contracts is recorded as unrealized gain (loss) in other comprehensive income (loss). In June 2018, Sharp entered into futures and swap agreements to mitigate the risk of fluctuations in wholesale propane index prices associated with 1.4 million gallons of propane expected to be purchased from August 2018 through June 2021. Under the futures and swap agreements, Sharp will receive the difference between the index prices (Mont Belvieu prices in August 2018 through June 2021) and the swap prices of $0.76 to $0.875 per gallon, to the extent the index price exceeds the contracted prices. If the index prices are lower than the swap prices, Sharp will pay the difference. At June 30, 2018, the futures and swap agreements had a fair value asset of approximately $18,000 and a fair value liability of $30,000. The change in the fair value of the swap agreements is recorded as unrealized gain (loss) in other comprehensive income (loss). Hedging Activities in 2017 In 2017, Sharp entered into futures and swap agreements to mitigate the risk of fluctuations in wholesale propane index prices associated with 7.7 million gallons of propane expected to be purchased from October 2017 through March 2019, of which positions covering 1.4 million gallons of forecasted future purchases were outstanding as of June 30, 2018. Under the futures and swap agreements, Sharp will receive the difference between the index prices (Mont Belvieu prices in October 2017 through March 2019) and the swap prices of $0.59 per gallon, to the extent the index price exceeds the contracted price. If the index prices are lower than the swap prices, Sharp will pay the difference. Sharp received approximately $645,000, which represented the difference between the index prices and the contracted prices in 2018 related to hedging activities originated in 2017 and received $11,000, which represented the mark-to-market activities for the three months ended June 30, 2018. At June 30, 2018, the futures and swap agreements had a fair value asset of approximately $306,000. The change in the fair value of the swap agreements is recorded as unrealized gain (loss) in other comprehensive income (loss). In August 2017, PESCO entered into natural gas swap agreements associated with financial contracts acquired in the ARM acquisition to mitigate the risk of fluctuations in wholesale natural gas prices associated with 844,000 Dts of natural gas PESCO expects to purchase through January 2020. We accounted for these swap agreements as cash flow hedges, which have a fair value liability of approximately $120,000 at June 30, 2018. The change in fair value of the natural gas swap agreements is recorded as unrealized gain (loss) in other comprehensive income (loss). The impact of PESCO's financial instruments that were not designated as hedges in our consolidated financial statements as of June 30, 2018 was a fair value asset of $90,000 and fair value liability of $77,000, respectively, which was recorded as an increase in gas costs during the six months ended June 30, 2018 associated with 1.1 million and 512,500 Dts of natural gas, respectively. Balance Sheet Offsetting PESCO has entered into master netting agreements with counterparties that enable it to net the counterparties' outstanding accounts receivable and payable, which are presented on a net basis in the consolidated balance sheets. The following table summarizes the accounts receivable and payable on a gross and net basis at June 30, 2018 and December 31, 2017:
The following tables present information about the fair value and related gains and losses of our derivative contracts. We did not have any derivative contracts with a credit risk-related contingency. The fair values of the derivative contracts recorded in the condensed consolidated balance sheets as of June 30, 2018 and December 31, 2017, are as follows:
The effects of gains and losses from derivative instruments on the condensed consolidated financial statements are as follows:
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- References No definition available.
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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value of Financial Instruments |
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fair Value of Financial Instruments | Fair Value of Financial Instruments GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation methods used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are the following: Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2: Quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability; and Level 3: Prices or valuation techniques requiring inputs that are both significant to the fair value measurement and unobservable (i.e. supported by little or no market activity). Financial Assets and Liabilities Measured at Fair Value The following table summarizes our financial assets and liabilities that are measured at fair value on a recurring basis and the fair value measurements, by level, within the fair value hierarchy as of June 30, 2018 and December 31, 2017:
The following valuation techniques were used to measure the fair value of assets and liabilities in the tables above: Level 1 Fair Value Measurements: Investments - equity securities — The fair values of these trading securities are recorded at fair value based on unadjusted quoted prices in active markets for identical securities. Investments - mutual funds and other — The fair values of these investments, comprised of money market and mutual funds, are recorded at fair value based on quoted net asset values of the shares. Level 2 Fair Value Measurements: Derivative assets and liabilities — The fair values of forward contracts are measured using market transactions in either the listed or OTC markets. The fair value of the propane put/call options, swap agreements and natural gas futures contracts are measured using market transactions for similar assets and liabilities in either the listed or OTC markets. Level 3 Fair Value Measurements: Investments - guaranteed income fund — The fair values of these investments are recorded at the contract value, which approximates their fair value. The following table sets forth the summary of the changes in the fair value of Level 3 investments for the six months ended June 30, 2018 and 2017:
Investment income from the Level 3 investments is reflected in other expense, (net) in the accompanying condensed consolidated statements of income. At June 30, 2018, there were no non-financial assets or liabilities required to be reported at fair value. We review our non-financial assets for impairment at least on an annual basis, as required. Other Financial Assets and Liabilities Financial assets with carrying values approximating fair value include cash and cash equivalents and accounts receivable. Financial liabilities with carrying values approximating fair value include accounts payable and other accrued liabilities and short-term debt. The fair value of cash and cash equivalents is measured using the comparable value in the active market and approximates its carrying value (Level 1 measurement). The fair value of short-term debt approximates the carrying value due to its short maturities and because interest rates approximate current market rates (Level 3 measurement). At June 30, 2018, long-term debt, including current maturities but excluding a capital lease obligation, had a carrying value of approximately $250.7 million. This compares to a fair value of approximately $250.3 million, using a discounted cash flow methodology that incorporates a market interest rate based on published corporate borrowing rates for debt instruments with similar terms and average maturities, and with adjustments for duration, optionality, and risk profile. At December 31, 2017, long-term debt, including the current maturities but excluding a capital lease obligation, had a carrying value of approximately $205.2 million, compared to the estimated fair value of approximately $215.4 million. The valuation technique used to estimate the fair value of long-term debt would be considered a Level 3 measurement. |
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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt |
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| Debt Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Long-Term Debt | Long-Term Debt Our outstanding long-term debt is shown below:
(1) FPU secured first mortgage bonds are guaranteed by Chesapeake Utilities. In January 2018, we borrowed an additional $25.0 million under the Revolver, which we classified as long-term debt due to the stated maturity date of October 8, 2020. In May 2018, we utilized a portion of the proceeds from the issuance of $50.0 million of 3.48% Series A notes to repay the $25.0 million of long-term debt borrowed under the Revolver. For additional information regarding the issuance of the Series A notes, see "Shelf Agreements" below. Shelf Agreements In October 2015, we entered into the $150.0 million Prudential Shelf Agreement, under which we may request that Prudential purchase up to $150.0 million of our unsecured senior debt. As of June 30, 2018, we have issued $70.0 million of 3.25% Prudential Shelf Notes. In March 2017, we entered into the MetLife Shelf Agreement and the NYL Shelf Agreement, under which we may request that MetLife and NYL, through March 2, 2020, purchase up to $150.0 million of Met Life Shelf Notes and $100.0 million NYL Shelf Notes, respectively. The unsecured senior debt would have a fixed interest rate and a maturity date not to exceed 20 years from the date of issuance. MetLife and NYL are under no obligation to purchase any unsecured senior debt. The interest rate and terms of payment of any series of unsecured senior debt will be determined at the time of purchase. In November 2017, NYL agreed to purchase $50.0 million of 3.48% Series A notes and $50.0 million of 3.58% Series B notes. The Series A notes were issued in May 2018 and the Series B notes will be issued on or before November 20, 2018. The proceeds received from the issuances of these NYL Shelf Notes will be used to reduce borrowings under the Revolver and/or lines of credit and/or to fund capital expenditures. The NYL Shelf Agreement has been fully utilized. As of June 30, 2018, we have $230.0 million of additional potential borrowing capacity under the Prudential and MetLife Shelf Agreements. The Prudential Shelf Agreement and the NYL Shelf Agreement set forth certain business covenants to which we are subject when any note is outstanding, including covenants that limit or restrict our ability, and the ability of our subsidiaries, to incur indebtedness, or place or permit liens and encumbrances on any of our property or the property of our subsidiaries. |
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- Definition The entire disclosure for long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Accounting Policies (Policies) |
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| Accounting Policies [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Basis of Presentation | Basis of Presentation References in this document to the “Company,” “Chesapeake Utilities,” “we,” “us” and “our” are intended to mean Chesapeake Utilities Corporation, its divisions and/or its subsidiaries, as appropriate in the context of the disclosure. The accompanying unaudited condensed consolidated financial statements have been prepared in compliance with the rules and regulations of the SEC and GAAP. In accordance with these rules and regulations, certain information and disclosures normally required for audited financial statements have been condensed or omitted. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto, included in our latest Annual Report on Form 10-K for the year ended December 31, 2017. In the opinion of management, these financial statements reflect normal recurring adjustments that are necessary for a fair presentation of our results of operations, financial position and cash flows for the interim periods presented. Due to the seasonality of our business, results for interim periods are not necessarily indicative of results for the entire fiscal year. Revenue and earnings are typically greater during the first and fourth quarters, when consumption of energy is highest due to colder temperatures. |
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| Business Acquisition [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Business Acquisitions, by Acquisition [Table Text Block] | ARM, Chipola and Central Gas Asset Acquisitions In August 2017, PESCO acquired certain natural gas marketing assets of ARM. The acquired assets complement PESCO’s existing asset portfolio and expanded our regional footprint and retail demand in a market where we had existing pipeline capacity and wholesale liquidity. We accounted for the purchase of these assets as a business combination and initially recorded goodwill of $6.8 million, within our Unregulated Energy segment. In connection with the acquisition, we initially recorded a contingent consideration liability of $2.5 million, based on the acquired business achieving a gross margin target in 2018. During the second quarter of 2018, we identified certain known information as of the acquisition date that was not considered in our original assessment and would have resulted in no contingent consideration liability being initially recorded. Therefore, we reversed the originally-recorded contingent liability and reduced goodwill by $2.5 million. We have similarly revised the condensed consolidated balance sheet as of December 31, 2017. These revisions are considered immaterial to our condensed consolidated financial statements. The contingent liability will be re-evaluated each reporting period in 2018. However, our current assessment is that no contingent consideration will be paid. In August 2017, Flo-gas acquired certain operating assets of Chipola, which provides propane distribution service to approximately 800 residential and commercial customers in Bay, Calhoun, Gadsden, Jackson, Liberty, and Washington Counties, Florida. In December 2017, Flo-gas acquired certain operating assets of Central Gas, which provides propane distribution service to approximately 325 residential and commercial customers in Glades, Highlands, Martin, Okeechobee, and St. Lucie Counties, Florida. The revenue and net income from these acquisitions that were included in our condensed consolidated statements of income for the three and six months ended June 30, 2018, were not material. The amounts recorded in conjunction with our acquisitions are preliminary and subject to adjustment based on additional valuations performed during the measurement period. |
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| FASB Statements and Other Authoritative Pronouncements | FASB Statements and Other Authoritative Pronouncements Recently Adopted Accounting Standards Revenue from Contracts with Customers (ASC 606) - On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers, and all the related amendments using the modified retrospective method. We recognized the cumulative effect of initially applying the new revenue standard to all of our contracts as an adjustment to the beginning balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We expect the impact of the adoption of the new revenue standard to be immaterial to our net income on an ongoing basis. This standard requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. The guidance also requires a number of disclosures regarding the nature, amount, timing, and uncertainty of revenue and the related cash flows. See Note 3, Revenue Recognition, for additional information. The following highlights the impact of the adoption of ASC 606 on our condensed consolidated income statements for the three and six months ended June 30, 2018 and condensed consolidated balance sheet as of June 30, 2018:
The primary impact of the adoption of ASC 606 on our income statement was the delayed recognition of approximately $204,000 in revenue in the first six months of 2018 to future years and a cumulative adjustment that decreased retained earnings and other assets by $1.6 million at June 30, 2018, associated with a long-term firm transmission contract with an industrial customer. Compensation-Retirement Benefits (ASC 715) - In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post Retirement Benefit Cost. Under this guidance, employers are required to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit costs are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. The update allows for capitalization of the service cost component when applicable. We adopted ASU 2017-07 on January 1, 2018 and applied the changes in the presentation of the service cost and other components of net benefit costs, retrospectively. Aside from changes in presentation, implementation of this standard did not have a material impact on our financial position or results of operations. Statement of Cash Flows (ASC 230) - In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments, which clarifies how certain transactions are classified in the statement of cash flows. We adopted ASU 2016-15 on January 1, 2018. Implementation of this new standard did not have a material impact on our condensed consolidated statement of cash flows. Compensation - Stock Compensation (ASC 718) - In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting, to clarify when to account for a change in the terms or conditions of a share-based payment award as a modification. Under this guidance, modification accounting is required only if the fair value, the vesting conditions or the award classification (equity or liability) changes because of a change in the terms or conditions of the award. We adopted ASU 2017-09, prospectively, on January 1, 2018. Implementation of this new standard did not have a material impact on our financial position or results of operations. Income Statement - Reporting Comprehensive Income (ASC 220) - In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the TCJA. We adopted ASU 2018-02 on January 1, 2018 and reclassified stranded tax effects from accumulated other comprehensive loss related to our employee benefit plans and commodity contract cash flows hedges. Implementation of this new standard did not have a material impact on our financial position and results of operations. See Note 8, Stockholders' Equity, for additional information. Recent Accounting Standards Yet to be Adopted Leases (ASC 842) - In February 2016, the FASB issued ASU 2016-02, Leases, which provides updated guidance regarding accounting for leases. This update requires a lessee to recognize a lease liability and a lease asset for all leases, including operating leases, with a term greater than 12 months on its balance sheet. The update also expands the required quantitative and qualitative disclosures surrounding leases. ASU 2016-02 will be effective for our annual and interim financial statements beginning January 1, 2019, although early adoption is permitted. The FASB allows companies to elect several practical expedients, in order to simplify the transition to the new standard. The following three expedients must all be elected together:
•An entity need not reassess initial direct costs for any existing leases. Other practical expedients that can be elected individually are:
We expect to use the practical expedients to assist in implementation of this standard. We have assessed all of our leases and have concluded that we may have some operating leases that qualify for the short-term lease exception. Upon adoption, we will record the right-of-use assets and the lease liabilities related to our operating leases with a lease term in excess of one year. We do not believe that this will have a material impact on our financial position, results of operations or cash flows. In January 2018, the FASB issued ASU 2018-01, Land Easement Practical Expedient for Transition to Topic 842, which provides a practical expedient under Topic 842 to not evaluate existing or expired land easements that were not previously accounted for as leases. We plan to utilize the provided practical expedient for existing and expired land easements and will assess all new or modified land easements and right-of-way agreements, under the guidance of ASU 2016-02, following its adoption. Intangibles-Goodwill (ASC 350) - In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment, which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. ASU 2017-04 will be effective for our annual and interim financial statements beginning January 1, 2020, although early adoption is permitted. The amendments included in this ASU are to be applied prospectively. We believe that implementation of this new standard will not have a material impact on our financial position or results of operations. Derivatives and Hedging (ASC 815) - In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities, to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. Among other changes to hedge designation, ASU 2017-12 expands the risks that can be designated as hedged risks in cash flow hedges to include cash flow variability from contractually specified components of forecasted purchases or sales of non-financial assets. ASU 2017-12 requires the entire change in fair value of a hedging instrument included in the assessment of hedge effectiveness to be presented in the same income statement line that is used to present the earnings effects of the hedged item for fair value hedges and in other comprehensive income for cash flow hedges. For disclosures, ASU 2017-12 requires a tabular presentation of the income statement effect of fair value and cash flow hedges, and it eliminates the requirement to disclose the ineffective portion of the change in fair value of hedging instruments. ASU 2017-12 will be effective for our annual and interim financial statements beginning January 1, 2019, although early adoption is permitted. We intend to adopt the updated hedge accounting standard in 2018, which we expect will reduce the MTM volatility in PESCO’s results due to better alignment of risk management activities and financial reporting, risk component hedging and certain other simplifications of hedge accounting guidance. Compensation - Stock Compensation (ASC 718) - In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting, which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 will be effective for our annual and interim financial statements beginning January 1, 2019, although early adoption is permitted. We believe that implementation of this new standard will not have a material impact on our financial position or results of operations. |
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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Accounting Policies Impact of Adoption of ASC 606 (Tables) |
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| Revenue from Contract with Customer [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] | The following highlights the impact of the adoption of ASC 606 on our condensed consolidated income statements for the three and six months ended June 30, 2018 and condensed consolidated balance sheet as of June 30, 2018:
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- References No definition available.
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- Definition Tabular disclosure of the comparison between amounts disclosed under previous guidance and new guidance. No definition available.
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Calculation of Earnings Per Share (Tables) |
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Calculation of Basic and Diluted Earnings Per Share |
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- References No definition available.
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Revenue Recognition (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Revenue from Contract with Customer [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Disaggregation of Revenue [Table Text Block] | The following table displays our revenue by major source based on product and service type for the three months ended June 30, 2018:
(1) Includes other revenue (revenues from sources other than contracts with customers) of $(356,000) and $82,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to weather normalization for Maryland division and Sandpiper and late fees. The following table displays our revenue by major source based on product and service type for the six months ended June 30, 2018:
(1) Includes other revenue (revenues from sources other than contracts with customers) of $(945,000) and $155,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to weather normalization for Maryland division and Sandpiper and late fees. |
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| Contract with Customer, Asset and Liability [Table Text Block] | The opening and closing balances of our trade receivables, contract assets, and contract liabilities are as follows:
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| X | ||||||||||
- Definition Tabular disclosure of contract balances and changes in contract balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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Environmental Commitments and Contingencies Summary of Environmental Liabilities (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||
| Environmental Commitments and Contingencies [Abstract] | |||||||||||||||||||||||||||||||||||||||||
| Environmental Remedies [Table Text Block] |
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- Definition Environmental Commitments and Contingencies [Abstract] No definition available.
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- Definition Environmental Remedies [Table Text Block] No definition available.
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Segment Information (Tables) |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Segment Reporting [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Segment Reporting Information by Segment | The following table presents financial information about our reportable segments:
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| X | ||||||||||
- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) (Tables) |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Changes in Accumulated Other Comprehensive Loss |
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| Reclassifications out of Accumulated Other Comprehensive Income (Loss) | The following table presents amounts reclassified out of accumulated other comprehensive loss for the three and six months ended June 30, 2018 and 2017. Deferred gains or losses for our commodity contracts cash flow hedges are recognized in earnings upon settlement.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Employee Benefit Plans (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Retirement Benefits [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Net Benefit Costs [Table Text Block] | Net periodic benefit costs for our pension and post-retirement benefits plans for the three and six months ended June 30, 2018 and 2017 are set forth in the following tables:
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| Amounts Included in Regulatory asset and AOCI [Table Text Block] | The following tables present the amounts included in the regulatory asset and accumulated other comprehensive loss that were recognized as components of net periodic benefit cost during the three months ended June 30, 2018 and 2017:
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| X | ||||||||||
- Definition [Table Text Block] for Amounts Included in Regulatory asset and AOCI [Table] No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Investments (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investments, Debt and Equity Securities [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Investments schedule [Table Text Block] | The investment balances at June 30, 2018 and December 31, 2017, consisted of the following:
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| X | ||||||||||
- Definition A table of investments, shown as a text block. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
|
Share-Based Compensation (Tables) |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shares awarded to non-employee directors [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | The table below presents the amounts included in net income related to share-based compensation expense for the three and six months ended June 30, 2018 and 2017:
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| Awards to non-employee directors [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shares awarded to non-employee directors [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Compensation, Activity | The table below presents the summary of the stock activity for awards to non-employee directors for the six months ended June 30, 2018:
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| Award to key employees [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shares awarded to non-employee directors [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Share-based Compensation, Activity | The table below presents the summary of the stock activity for awards to key employees for the six months ended June 30, 2018:
|
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| X | ||||||||||
- Definition [Line Items] for Shares awarded to non-employee directors [Table] No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Derivative Instruments (Tables) |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Offsetting Assets and Liabilities [Table Text Block] | Balance Sheet Offsetting PESCO has entered into master netting agreements with counterparties that enable it to net the counterparties' outstanding accounts receivable and payable, which are presented on a net basis in the consolidated balance sheets. The following table summarizes the accounts receivable and payable on a gross and net basis at June 30, 2018 and December 31, 2017:
The following tables present information about the fair value and related gains and losses of our derivative contracts. We did not have any derivative contracts with a credit risk-related contingency. |
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| Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet | The fair values of the derivative contracts recorded in the condensed consolidated balance sheets as of June 30, 2018 and December 31, 2017, are as follows:
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| Effects of Gains and Losses from Derivative Instruments on Condensed Consolidated Financial Statements | The effects of gains and losses from derivative instruments on the condensed consolidated financial statements are as follows:
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- Definition [Table Text Block] for Offsetting Assets and Liabilities [Table] No definition available.
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- References No definition available.
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value of Financial Instruments (Tables) |
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| Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table summarizes our financial assets and liabilities that are measured at fair value on a recurring basis and the fair value measurements, by level, within the fair value hierarchy as of June 30, 2018 and December 31, 2017:
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| Summary of Changes in Fair Value of Investments | The following table sets forth the summary of the changes in the fair value of Level 3 investments for the six months ended June 30, 2018 and 2017:
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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt (Tables) |
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| Debt Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outstanding Long-Term Debt | Our outstanding long-term debt is shown below:
(1) FPU secured first mortgage bonds are guaranteed by Chesapeake Utilities. |
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- References No definition available.
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. No definition available.
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Summary of Accounting policies - Additional Information (Details) $ in Thousands |
6 Months Ended |
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Jun. 30, 2018
USD ($)
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| Summary of Accounting Policies [Abstract] | |
| Cumulative Effect of New Accounting Principle in Period of Adoption | $ 1,600 |
| Delay of Revenue Recognition Due To Implementation of New Standard | $ 204 |
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- Definition Delay of Revenue Recognition Due To Implementation of New Standard No definition available.
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- Definition Summary of Accounting Policies [Abstract] No definition available.
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- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Accounting Policies Acquisitions Additional information (Details) |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2017
USD ($)
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Jun. 30, 2018
USD ($)
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| Business Acquisition [Line Items] | ||
| Number of customers acquired through acquisition | 800 | |
| ARM Energy [Member] | ||
| Business Acquisition [Line Items] | ||
| Business Combination, Liabilities Arising from Contingencies, Amount Recognized | $ 2,500,000.0 | |
| Central Gas [Member] | ||
| Business Acquisition [Line Items] | ||
| Number of customers acquired through acquisition | 325 | |
| Unregulated Energy [Member] | ARM [Member] | ||
| Business Acquisition [Line Items] | ||
| Goodwill, Acquired During Period | $ 6,800,000 |
| X | ||||||||||
- Definition Number of customers acquired through acquisition No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Summary of Accounting Policies Summary of Effect of Adoption on Consolidated Financial Statements (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
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| Item Effected [Line Items] | |||||
| Accrued revenue | $ 12,353 | $ 12,353 | $ 22,279 | ||
| Regulated Energy Operating Revenue | 70,504 | $ 70,996 | 179,897 | $ 168,650 | |
| Regulated Energy cost of sales | 20,010 | 24,167 | 68,241 | 64,411 | |
| Depreciation and amortization | 9,839 | 9,094 | 19,543 | 17,906 | |
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 9,105 | 9,986 | 45,915 | 41,646 | |
| Income taxes | 2,718 | 3,940 | 12,674 | 16,456 | |
| Net Income | 6,387 | $ 6,046 | 33,241 | $ 25,190 | 58,124 |
| Other assets | 4,440 | 4,440 | 3,699 | ||
| Retained earnings | 250,377 | 250,377 | $ 229,141 | ||
| Calculated under Revenue Guidance in Effect before Topic 606 [Member] | |||||
| Item Effected [Line Items] | |||||
| Accrued revenue | 13,659 | 13,659 | |||
| Regulated Energy Operating Revenue | 70,728 | 180,780 | |||
| Regulated Energy cost of sales | 20,139 | 68,942 | |||
| Depreciation and amortization | 9,832 | 19,521 | |||
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | 9,207 | 46,119 | |||
| Income taxes | 2,746 | 12,733 | |||
| Net Income | 6,461 | 33,386 | |||
| Other assets | 4,777 | 4,777 | |||
| Retained earnings | 248,734 | 248,734 | |||
| Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | |||||
| Item Effected [Line Items] | |||||
| Accrued revenue | (1,306) | (1,306) | |||
| Deferred Revenue, Period Increase (Decrease) | (224) | (883) | |||
| Regulated Energy cost of sales | (129) | (701) | |||
| Depreciation and amortization | 7 | 22 | |||
| Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (102) | (204) | |||
| Income taxes | (28) | (59) | |||
| Net Income | (74) | (145) | |||
| Other assets | (337) | (337) | |||
| Retained earnings | $ 1,643 | $ 1,643 | |||
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- Definition Accrued revenue. No definition available.
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- Definition Receivables and other deferred charges No definition available.
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- Definition Regulated energy cost of sales No definition available.
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- Definition Amount of increase (decrease) in deferred revenue. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The total amount of regulated operating revenues recognized during the period. No definition available.
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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Calculation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
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| Calculation of Basic Earnings Per Share: | |||||
| Net Income | $ 6,387 | $ 6,046 | $ 33,241 | $ 25,190 | $ 58,124 |
| Weighted shares outstanding (shares) | 16,369,641 | 16,340,665 | 16,360,540 | 16,329,009 | |
| Basic Earnings Per Share (in dollars per share) | $ 0.39 | $ 0.37 | $ 2.03 | $ 1.54 | |
| Reconciliation of Numerator: | |||||
| Net Income | $ 6,387 | $ 6,046 | $ 33,241 | $ 25,190 | $ 58,124 |
| Reconciliation of Denominator: | |||||
| Weighted shares outstanding - Basic (shares) | 16,369,641 | 16,340,665 | 16,360,540 | 16,329,009 | |
| Effect of dilutive securities: | |||||
| Share-based compensation (shares) | 47,441 | 41,542 | 49,521 | 44,029 | |
| Adjusted denominator-Diluted (shares) | 16,417,082 | 16,382,207 | 16,410,061 | 16,373,038 | |
| Diluted Earnings Per Share (in dollars per share) | $ 0.39 | $ 0.37 | $ 2.03 | $ 1.54 | |
| X | ||||||||||
- Definition Effect of dilutive securities. No definition available.
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- Definition Reconciliation of denominator. No definition available.
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- Definition Reconciliation of numerator: No definition available.
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| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Revenue Recognition Additional Information (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
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| Revenues | $ 136,664,000 | $ 125,084,000 | $ 376,020,000 | $ 310,244,000 | |
| Contract with Customer, Liability, Current | 175,000 | 175,000 | $ 407,000 | ||
| Contract with Customer, Liability, Revenue Recognized | 84,000 | 336,000 | |||
| Regulated Energy [Member] | Other [Member] | |||||
| Revenues | (356,000) | (945,000) | |||
| Unregulated Energy [Member] | Other [Member] | |||||
| Revenues | $ 82,000 | $ 155,000 | |||
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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| X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Revenue Recognition Disegragation of Revenue (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2018 |
||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | [1] | $ 136,664 | $ 376,020 | ||
| Consolidation, Eliminations [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (23,104) | (51,087) | |||
| Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 70,504 | 179,897 | ||
| Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | [1] | 76,345 | 221,712 | ||
| Other Segments And Intersegments Eliminations [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (10,185) | (25,589) | |||
| Other [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | [1] | (10,185) | (25,589) | ||
| Other [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (2,743) | (7,495) | |||
| Eliminations [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (10,176) | (18,003) | |||
| Energy Distribution [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 63,210 | 162,735 | |||
| Energy Distribution [Member] | Florida Natural Gas Distribution [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 6,317 | 12,180 | |||
| Energy Distribution [Member] | Florida Public Utilities Company [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 18,281 | 41,494 | |||
| Energy Distribution [Member] | Maryland Natural Gas [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 4,001 | 14,673 | |||
| Energy Distribution [Member] | Delaware natural gas division [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 11,882 | 43,954 | |||
| Energy Distribution [Member] | FPU Electric Distribution [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 18,362 | 37,103 | |||
| Energy Distribution [Member] | Sandpiper [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 4,367 | 13,331 | |||
| Energy Transmission [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 23,324 | 53,096 | |||
| Energy Transmission [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 17,470 | 35,165 | |||
| Energy Transmission [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 5,854 | 17,931 | |||
| Energy Transmission [Member] | Aspire [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 5,854 | 17,931 | |||
| Energy Transmission [Member] | Eastern Shore Gas Company [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 14,502 | 30,100 | |||
| Energy Transmission [Member] | Peninsula Pipeline [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 2,968 | 5,065 | |||
| Energy Generation [Member] | Eight Flags [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 4,230 | 8,608 | |||
| Propane Delivery [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 20,206 | 72,311 | |||
| Propane Delivery [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 20,206 | 72,311 | |||
| Propane Delivery [Member] | Delmarva Peninsula Propane Delivery [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 15,264 | 60,735 | |||
| Propane Delivery [Member] | Florida Propane [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 4,942 | 11,576 | |||
| Energy Services [Member] | PESCO [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 48,798 | 130,357 | |||
| Eliminations [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (23,803) | (52,473) | |||
| Eliminations [Member] | Regulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (10,176) | (18,003) | |||
| Eliminations [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (3,248) | (8,494) | |||
| Eliminations [Member] | Eliminations [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | (10,379) | (25,976) | |||
| Other [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 699 | 1,386 | |||
| Other [Member] | Unregulated Energy [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | 505 | 999 | |||
| Other [Member] | Other [Member] | |||||
| Disaggregation of Revenue [Line Items] | |||||
| Revenue from Contract with Customer, Excluding Assessed Tax | $ 194 | $ 387 | |||
| |||||
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Revenue Recognition Contract Balances with Customers (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Dec. 31, 2017 |
|
| Revenue from Contract with Customer [Abstract] | ||
| Receivables from Customers | $ 51,511 | $ 74,962 |
| Contract with Customer, Asset, Net, Noncurrent | 1,967 | 1,270 |
| Contract with Customer, Liability, Current | 175 | $ 407 |
| Increase (Decrease) in Receivables | (23,451) | |
| Increase (Decrease) in Other Noncurrent Assets | 697 | |
| Increase (Decrease) in Other Current Liabilities | $ (232) |
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase (decrease) in current liabilities classified as other. No definition available.
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- Definition Amount of increase (decrease) in noncurrent assets classified as other. No definition available.
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- Definition The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
|
Rates and Other Regulatory Activities - Additional Information (Detail) |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2018
USD ($)
dekatherm / d
unit
mi
|
Dec. 31, 2017
USD ($)
|
|
| Rates and Other Regulatory Activities [Line Items] | ||
| Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |
| Electric Distribution [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Amount of Regulatory Costs Not yet Approved | $ 15,200,000 | |
| Electric Limited Proceedings [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Asset Recovery Damaged Property Costs, Noncurrent | 1,500,000 | |
| Deferred Storm and Property Reserve Deficiency, Noncurrent | 800,000 | |
| Public Utilities, Requested Rate Increase (Decrease), Amount | 1.82 | |
| Eastern Shore [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Cost of Services | 60,000,000 | |
| Public Utilities, Requested Rate Increase (Decrease), Amount | $ 18,900,000 | |
| Public Utilities, Requested Return on Equity, Percentage | 13.75% | |
| Number of Months Rates Suspended | 5 months | |
| Increase in Revenue Recognized Due to Motion Rate in Effect | $ 3,700,000 | |
| 2017 Expansion Project [Member] | Eastern Shore [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Estimated Capital Cost | $ 117,000,000 | |
| Number of pipeline miles requested | mi | 23 | |
| Revised Miles Of Natural Gas Pipeline | mi | 17 | |
| Pressure Control Stations | 2 | |
| Firm natural gas transportation deliverability | dekatherm / d | 61,162 | |
| Additional Firm Natural Gas Transportation Deliverability | dekatherm / d | 52,500 | |
| Subscribers [Member] | 2017 Expansion Project [Member] | Eastern Shore [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Number of customers | 7 | |
| Number of affiliates | unit | 3 | |
| Pre TCJA approved revenue requirements [Member] | Eastern Shore [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Public Utilities, Approved Rate Increase (Decrease), Amount | $ 9,800,000 | |
| Post TCJA approved revenue requirements [Member] | Eastern Shore [Member] | ||
| Rates and Other Regulatory Activities [Line Items] | ||
| Public Utilities, Approved Rate Increase (Decrease), Amount | $ 6,600,000 |
| X | ||||||||||
- Definition Additional Firm Natural Gas Transportation Deliverability No definition available.
|
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- Definition Estimated Capital Cost No definition available.
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- Definition firm natural gas transportation deliverability No definition available.
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- Definition Increase in Revenue Recognized Due to Motion Rate in Effect No definition available.
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- Definition Miles Of Natural Gas Pipeline No definition available.
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- Definition Number of Months Rates Suspended No definition available.
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- Definition Number of Pipeline Miles No definition available.
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- Definition Number of affiliates No definition available.
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- Definition number of customers No definition available.
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- Definition Pressure Control Stations No definition available.
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- Definition Rates and Other Regulatory Activities [Line Items] No definition available.
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- Definition Amount of regulatory costs not yet approved by the regulatory authority. No definition available.
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- Definition Carrying amount as of the balance sheet date of the portion of the reserved funds established by a utility from customer payments to cover the repair costs of damages from major storms, which repairs are expected to be incurred beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Total costs related to services rendered by an entity during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying amount as of the balance sheet date of capitalized storm costs of a regulated entity that are expected to be recoverable through rate adjustments after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. No definition available.
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- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. No definition available.
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- Definition Percentage of public utility's requested return on equity. No definition available.
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Environmental Commitments and Contingencies - Additional Information (Detail) |
6 Months Ended | |
|---|---|---|
|
Jun. 30, 2018
USD ($)
site
|
Dec. 31, 2017
USD ($)
|
|
| Environmental Commitments And Contingencies [Line Items] | ||
| Company's exposure in number of former Manufactured Gas Plant Sites | site | 7 | |
| Environmental liabilities | $ 8,090,000 | $ 8,263,000 |
| West Palm Beach Florida [Member] | Minimum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Estimated costs of remediation range, minimum | 4,500,000 | |
| West Palm Beach Florida [Member] | Maximum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Estimated costs of remediation range, minimum | 15,400,000 | |
| Sanford Florida [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Environmental remediation expense | 10,000 | |
| Winter Haven Florida [Member] | Maximum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Environmental remediation expense | 425,000 | |
| Seaford [Member] | Minimum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Estimated costs of remediation range, minimum | 273,000 | |
| Seaford [Member] | Maximum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Estimated costs of remediation range, minimum | 465,000 | |
| FPU [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Environmental liabilities | 9,500,000 | |
| Approval of recovery of environmental costs | 14,000,000 | |
| Environmental costs recovered | 11,300,000 | |
| FPU [Member] | Manufactured Gas Plant [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Regulatory Assets for future recovery of environmental costs | $ 2,700,000 |
| X | ||||||||||
- Definition Company's exposure in number of former Manufactured Gas Plant Sites. No definition available.
|
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- Definition Environmental Commitments And Contingencies [Line Items] No definition available.
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- Definition Maximum amount of environmental costs that can be recovered from insurance and customers. No definition available.
|
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- Definition Regulatory assets related to environmental costs. No definition available.
|
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of any recovery from third parties that is credited to environmental remediation costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Estimate of reasonably possible loss exposure in excess of amount accrued for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Other Commitments and Contingencies - Additional Information (Detail) gal in Millions, $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2018
USD ($)
gal
| |
| Commitments and Contingencies Disclosure [Abstract] | |
| Number of Years for Asset Management Agreement | 3 years |
| Number of years to purchase propane under contract | 6 years |
| Estimated current annual commitment | gal | 2.2 |
| Debt Service Coverage Ratio | 1.25 |
| Ratio based on average number of prior quarters | 6 |
| Number of Propane Price Indices | 2 |
| Ratios based on average of the prior quarters | 1 year 6 months |
| Funds from operations interest coverage ratio minimum times | 2 |
| Total debt to capital maximum | 0.65 |
| Number Of Years For Power Purchase Agreement | 20 years |
| Contract Duration | 20 years |
| Aggregate guaranteed amount | $ 72.5 |
| Draws on letters of credit | $ 5.0 |
| X | ||||||||||
- Definition Annual Estimate Of Volume Of Propane To Be Purchased No definition available.
|
| X | ||||||||||
- Definition Contract Duration In Number Of Years No definition available.
|
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- Definition Debt Service Coverage Ratio No definition available.
|
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- Definition Maximum debt to net capital ratio under agreement two. No definition available.
|
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- Definition Minimum interest coverage ratio under agreement two. No definition available.
|
| X | ||||||||||
- Definition Number Of Years For Power Purchase Agreement No definition available.
|
| X | ||||||||||
- Definition Number Of Years To Purchase Propane Under Contract No definition available.
|
| X | ||||||||||
- Definition Number of Propane Price Indices No definition available.
|
| X | ||||||||||
- Definition Number of Years for Asset Management Agreement No definition available.
|
| X | ||||||||||
- Definition Ratio based on average number of prior quarters No definition available.
|
| X | ||||||||||
- Definition Ratios based on average of the prior quarters No definition available.
|
| X | ||||||||||
- Definition Standby Letters Of Credit No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Segment Information - Schedule of Segment Reporting Information by Segment (Detail) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2017
USD ($)
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2017
USD ($)
|
Dec. 31, 2017
USD ($)
|
||||
| Segment Reporting Information [Line Items] | ||||||||
| Number of Reportable Segments | 2 | |||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | $ 136,664 | $ 125,084 | $ 376,020 | $ 310,244 | ||||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | 136,664 | 125,084 | 376,020 | 310,244 | ||||
| Operating Income | ||||||||
| Total operating income | 13,248 | 14,061 | 53,654 | 49,160 | ||||
| Other expense, net | (262) | (1,002) | (194) | (1,703) | ||||
| Interest | 3,881 | 3,073 | 7,545 | 5,811 | ||||
| Income Before Income Taxes | 9,105 | 9,986 | 45,915 | 41,646 | ||||
| Income taxes | 2,718 | 3,940 | 12,674 | 16,456 | ||||
| Net Income | 6,387 | 6,046 | 33,241 | 25,190 | $ 58,124 | |||
| Identifiable Assets | ||||||||
| Total identifiable assets | 1,462,941 | 1,462,941 | 1,414,934 | |||||
| Regulated Energy [Member] | ||||||||
| Operating Income | ||||||||
| Total operating income | 14,304 | 14,086 | 41,015 | 37,481 | ||||
| Identifiable Assets | ||||||||
| Total identifiable assets | 1,199,672 | 1,199,672 | 1,121,673 | |||||
| Unregulated Energy [Member] | ||||||||
| Operating Income | ||||||||
| Total operating income | 490 | 2 | 14,174 | 11,577 | ||||
| Identifiable Assets | ||||||||
| Total identifiable assets | 227,191 | 227,191 | 259,041 | |||||
| Other [Member] | ||||||||
| Identifiable Assets | ||||||||
| Total identifiable assets | 36,078 | 36,078 | $ 34,220 | |||||
| Other and eliminations [Member] | ||||||||
| Operating Income | ||||||||
| Total operating income | (1,546) | (27) | (1,535) | 102 | ||||
| Operating Revenues, Unaffiliated Customers [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | 136,664 | 125,084 | 376,020 | 310,244 | ||||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | 136,664 | 125,084 | 376,020 | 310,244 | ||||
| Operating Revenues, Unaffiliated Customers [Member] | Regulated Energy [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | 67,731 | 68,815 | 173,685 | 165,261 | ||||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | 67,731 | 68,815 | 173,685 | 165,261 | ||||
| Operating Revenues, Unaffiliated Customers [Member] | Unregulated Energy [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | 68,933 | 56,269 | 202,335 | 144,983 | ||||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | 68,933 | 56,269 | 202,335 | 144,983 | ||||
| Intersegment Revenues [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 10,379 | 9,120 | 25,976 | 14,567 | |||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 10,379 | 9,120 | 25,976 | 14,567 | |||
| Intersegment Revenues [Member] | Regulated Energy [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 2,773 | 2,181 | 6,212 | 3,389 | |||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 2,773 | 2,181 | 6,212 | 3,389 | |||
| Intersegment Revenues [Member] | Unregulated Energy [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 7,412 | 6,780 | 19,377 | 10,791 | |||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 7,412 | 6,780 | 19,377 | 10,791 | |||
| Intersegment Revenues [Member] | Other [Member] | ||||||||
| Operating Revenues, Unaffiliated Customers | ||||||||
| Total operating revenues, unaffiliated customers | [1] | 194 | 159 | 387 | 387 | |||
| Intersegment Revenues | ||||||||
| Total operating revenues, unaffiliated customers | [1] | $ 194 | $ 159 | $ 387 | $ 387 | |||
| ||||||||
| X | ||||||||||
- Definition Intersegment revenues. No definition available.
|
| X | ||||||||||
- Definition Operating income. No definition available.
|
| X | ||||||||||
- Definition Total operating revenues unaffiliated customers. No definition available.
|
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
|
| X | ||||||||||
- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward] | ||
| Beginning balance | $ (4,272) | $ (4,878) |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (1,440) | 828 |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 901 | (1,194) |
| Net current-period other comprehensive income (loss) | (539) | (366) |
| Ending balance | (5,718) | (5,244) |
| Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | (907) | |
| UnrealizedGainsLossesFromDefinedBenefitPensionAndPostretirementPlanItems [Member] | ||
| Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward] | ||
| Beginning balance | (4,743) | (5,360) |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | (9) |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 189 | 180 |
| Net current-period other comprehensive income (loss) | 189 | 171 |
| Ending balance | (5,576) | (5,189) |
| Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | (1,022) | |
| Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member] | ||
| Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward] | ||
| Beginning balance | 471 | 482 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (1,440) | 837 |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 712 | (1,374) |
| Net current-period other comprehensive income (loss) | (728) | (537) |
| Ending balance | (142) | $ (55) |
| Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 115 | |
| X | ||||||||||
- Definition Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Roll Forward] No definition available.
|
| X | ||||||||||
- Definition Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect No definition available.
|
| X | ||||||||||
- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Derivative, Gain (Loss) on Derivative, Net | $ 985 | $ (224) | $ (5,134) | $ 2,067 | ||||||||
| Tax benefit | (2,718) | (3,940) | (12,674) | (16,456) | ||||||||
| Reclassification out of Accumulated Other Comprehensive Income [Member] | ||||||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Net of tax | (362) | 346 | (901) | 1,194 | ||||||||
| Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | ||||||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Prior service cost | [1] | 19 | 20 | 39 | 39 | |||||||
| Net loss | [1] | (149) | (170) | (297) | (339) | |||||||
| Total before tax | (130) | (150) | (258) | (300) | ||||||||
| Tax benefit | 36 | 61 | 69 | 120 | ||||||||
| Net of tax | (94) | (89) | (189) | (180) | ||||||||
| Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member] | ||||||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Total before tax | (373) | 708 | (989) | 2,246 | ||||||||
| Tax benefit | 105 | (273) | 277 | (872) | ||||||||
| Net of tax | (268) | 435 | (712) | 1,374 | ||||||||
| Propane Swap Agreement [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member] | ||||||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Other Comprehensive Income Loss Adjustments AOCI Swap Agreements | $ (181) | 77 | [2] | (645) | [2] | 465 | [2] | |||||
| Natural Gas Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member] | ||||||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | [2] | (481) | ||||||||||
| Natural Gas Futures [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated (Gain) Loss from Commodity Contracts Cash Flows Hedges [Member] | ||||||||||||
| Amortization of pension and postretirement items: | ||||||||||||
| Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | [2] | $ 631 | $ 137 | $ 1,781 | ||||||||
| ||||||||||||
| X | ||||||||||
- Definition Other Comprehensive Income Loss Adjustments AOCI Swap Agreements No definition available.
|
| X | ||||||||||
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Stockholder's Equity Stockholder's Equity Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Jun. 30, 2018 |
|
| Equity [Abstract] | ||
| Preferred Stock, Shares Authorized | 2,000,000 | 2,000,000 |
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 |
| Proceeds from Issuance of Common Stock | $ (10) |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Employee Benefit Plans (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||
| Amortization of prior service cost | $ (19) | $ (20) | $ (39) | $ (39) | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 236 | 276 | 473 | 551 | |||
| Chesapeake Postretirement Plan [Member] | |||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||
| Interest cost | 9 | 11 | 19 | 21 | |||
| Amortization of prior service cost | (19) | (20) | (39) | (39) | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 15 | 17 | 30 | 32 | |||
| Net periodic cost (benefit) | [1] | 5 | 8 | 10 | 14 | ||
| Total periodic cost | 5 | 8 | 10 | 14 | |||
| Florida Public Utilities Company Medical Plan [Member] | |||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||
| Interest cost | 13 | 13 | 26 | 26 | |||
| Net periodic cost (benefit) | [1] | 13 | 13 | 26 | 26 | ||
| Amortization of pre-merger regulatory asset | 2 | 2 | 4 | 4 | |||
| Total periodic cost | 15 | 15 | 30 | 30 | |||
| Florida Public Utilities Company Pension Plan [Member] | |||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||
| Interest cost | 592 | 624 | 1,184 | 1,247 | |||
| Expected return on plan assets | (774) | (700) | (1,549) | (1,399) | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 108 | 131 | 217 | 262 | |||
| Net periodic cost (benefit) | [1] | (74) | 55 | (148) | 110 | ||
| Amortization of pre-merger regulatory asset | 191 | 191 | 381 | 381 | |||
| Total periodic cost | 117 | 246 | 233 | 491 | |||
| Chesapeake Pension SERP [Member] | |||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||
| Interest cost | 21 | 22 | 42 | 44 | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 25 | 22 | 50 | 44 | |||
| Net periodic cost (benefit) | [1] | 46 | 44 | 92 | 88 | ||
| Total periodic cost | 46 | 44 | 92 | 88 | |||
| Chesapeake Pension Plan [Member] | |||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||
| Interest cost | 98 | 103 | 195 | 206 | |||
| Expected return on plan assets | (138) | (127) | (276) | (254) | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 88 | 106 | 176 | 213 | |||
| Net periodic cost (benefit) | [1] | 48 | 82 | 95 | 165 | ||
| Total periodic cost | $ 48 | $ 82 | $ 95 | $ 165 | |||
| |||||||
| X | ||||||||||
- Definition Amortization of pre-merger regulatory asset. No definition available.
|
| X | ||||||||||
- Definition Periodic Cost Benefit No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2018 |
Dec. 31, 2017 |
|
| Defined Benefit Plan Disclosure [Line Items] | |||
| Expected pension and postretirement benefit costs | $ 913 | ||
| Expected amortization of pre merger regulatory asset | 769 | ||
| Florida Public Utilities Company Pension Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Unamortized balance of regulatory asset | $ 942 | 942 | $ 1,300 |
| Contribution to pension plan | 539 | 848 | |
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 1,500 | 1,500 | |
| Chesapeake Pension Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Contribution to pension plan | 126 | 198 | |
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 359 | 359 | |
| Chesapeake Pension SERP [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Contribution to pension plan | 38 | 76 | |
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 151 | 151 | |
| Chesapeake Postretirement Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Contribution to pension plan | 7 | 18 | |
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | 97 | 97 | |
| Florida Public Utilities Company Medical Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Contribution to pension plan | 13 | 24 | |
| Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year | $ 88 | $ 88 |
| X | ||||||||||
- Definition Expected amortization of pre merger regulatory asset. No definition available.
|
| X | ||||||||||
- Definition Expected pension and postretirement benefit costs. No definition available.
|
| X | ||||||||||
- Definition Unamortized balance of regulatory asset. No definition available.
|
| X | ||||||||||
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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Employee Benefit Plans - Amounts Included in Regulatory Asset and Accumulated Other Comprehensive Income/Loss Recognized as Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
||||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||||||
| Prior service cost (credit) | $ (19) | $ (20) | $ (39) | $ (39) | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 236 | 276 | 473 | 551 | |||
| Recognized from accumulated other comprehensive loss | [1] | 130 | 150 | 258 | 300 | ||
| Recognized from regulatory asset | 87 | 106 | 176 | 212 | |||
| Total recognized in net periodic benefit cost | 217 | 256 | 434 | 512 | |||
| Chesapeake Pension Plan [Member] | |||||||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||||||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 88 | 106 | 176 | 213 | |||
| Recognized from accumulated other comprehensive loss | [1] | 88 | 106 | 176 | 213 | ||
| Total recognized in net periodic benefit cost | 88 | 106 | 176 | 213 | |||
| Florida Public Utilities Company Pension Plan [Member] | |||||||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||||||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 108 | 131 | 217 | 262 | |||
| Recognized from accumulated other comprehensive loss | [1] | 21 | 25 | 41 | 50 | ||
| Recognized from regulatory asset | 87 | 106 | 176 | 212 | |||
| Total recognized in net periodic benefit cost | 108 | 131 | 217 | 262 | |||
| Chesapeake Pension SERP [Member] | |||||||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||||||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 25 | 22 | 50 | 44 | |||
| Recognized from accumulated other comprehensive loss | [1] | 25 | 22 | 50 | 44 | ||
| Total recognized in net periodic benefit cost | 25 | 22 | 50 | 44 | |||
| Chesapeake Postretirement Plan [Member] | |||||||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] | |||||||
| Prior service cost (credit) | (19) | (20) | (39) | (39) | |||
| Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 15 | 17 | 30 | 32 | |||
| Recognized from accumulated other comprehensive loss | [1] | (4) | (3) | (9) | (7) | ||
| Total recognized in net periodic benefit cost | $ (4) | $ (3) | $ (9) | $ (7) | |||
| |||||||
| X | ||||||||||
- Definition Defined Benefit Plan Amounts Recognized From Regulatory Asset No definition available.
|
| X | ||||||||||
- Definition Defined Benefit Plan Amounts Recognized Gain (Loss) No definition available.
|
| X | ||||||||||
- Definition Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] No definition available.
|
| X | ||||||||||
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Investments - Schedule of Investments (Details) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Investments schedule [Line Items] | ||
| Investments, at fair value | $ 7,486 | $ 6,756 |
| Rabbi Trust Associated With Deferred Compensation Plan [Member] | ||
| Investments schedule [Line Items] | ||
| Investments, at fair value | 7,465 | 6,734 |
| Equity Securities [Member] | ||
| Investments schedule [Line Items] | ||
| Investments, at fair value | $ 21 | $ 22 |
| X | ||||||||||
- Definition [Line Items] for Investments schedule [Table] No definition available.
|
| X | ||||||||||
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
Investments - Additional Information (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Unrealized gain (loss), net of other expenses | $ 158,000 | $ 181,000 | $ 113,000 | $ 433,000 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
Share-Based Compensation - Share-Based Compensation Amounts Included in Net Income (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
Dec. 31, 2017 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Total compensation expense | $ 1,325 | $ 173 | $ 2,844 | $ 812 | |
| Less: tax benefit | (363) | (70) | (779) | (327) | |
| Share-Based Compensation amounts included in net income | 962 | 103 | $ 2,065 | 485 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 792 | ||||
| Awards to non-employee directors [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Total compensation expense | $ 135 | 136 | $ 269 | 271 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 0.00 | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ 75.70 | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 7,128 | ||||
| Award to key employees [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 131,741 | 131,741 | 132,642 | ||
| Total compensation expense | $ 1,190 | $ 37 | $ 2,575 | $ 541 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 67.46 | $ 67.46 | $ 59.31 | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 49,494 | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ 47.39 | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 29,786 | ||||
| Accelerated Vested Shares [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $ 1,100 | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ 75.78 | ||||
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. No definition available.
|
| X | ||||||||||
- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. No definition available.
|
| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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Share-Based Compensation - Summary of Stock Activity under the SICP (Detail) |
6 Months Ended |
|---|---|
|
Jun. 30, 2018
$ / shares
shares
| |
| Number of Shares | |
| Granted awards (shares) | 792 |
| Awards to non-employee directors [Member] | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted | 7,128 |
| Number of Shares | |
| Vested (shares) | (7,128) |
| Weighted Average Fair Value | |
| Outstanding - December 31, 2017 (in dollars per share) | $ / shares | $ 0.00 |
| Vested (in dollars per share) | $ / shares | $ 75.70 |
| Award to key employees [Member] | |
| Number of Shares | |
| Outstanding - December 31, 2017 (shares) | 132,642 |
| Granted awards (shares) | 49,494 |
| Vested (shares) | (29,786) |
| Expired (shares) | (3,933) |
| Outstanding - June 30, 2018 (shares) | 131,741 |
| Weighted Average Fair Value | |
| Outstanding - December 31, 2017 (in dollars per share) | $ / shares | $ 59.31 |
| Granted (in dollars per share) | $ / shares | 67.76 |
| Vested (in dollars per share) | $ / shares | 47.39 |
| Expired (in dollars per share) | $ / shares | 49.66 |
| Outstanding - June 30, 2018 (in dollars per share) | $ / shares | 67.46 |
| Accelerated Vested Shares [Member] | |
| Weighted Average Fair Value | |
| Vested (in dollars per share) | $ / shares | $ 75.78 |
| Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | 16,676 |
| Accelerated Vested Shares [Member] | Award to key employees [Member] | |
| Number of Shares | |
| Expired (shares) | 2,569 |
| Weighted Average Fair Value | |
| Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | 14,107 |
| X | ||||||||||
- Definition Share based compensation arrangement by share based payment award equity instruments other than options expirations weighted average grant date fair value. No definition available.
|
| X | ||||||||||
- Definition Share based compensation arrangement by share based payment award equity instruments other than options expired in period. No definition available.
|
| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Net number of non-option equity instruments granted to participants. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares for which recognition of compensation cost was accelerated. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
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| X | ||||||||||
- Details
|
Share-Based Compensation - Additional Information (Detail) $ in Thousands |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Jun. 30, 2018
USD ($)
unit
shares
|
Jun. 30, 2017
USD ($)
|
Dec. 31, 2017
shares
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted awards (shares) | 792 | ||
| Shares Paid for Tax Withholding for Share Based Compensation | 16,918 | 10,269 | |
| Payments Related to Tax Withholding for Share-based Compensation | $ | $ 1,210 | $ 692 | |
| Unrecognized compensation cost | $ | $ 3,200 | ||
| Awards to non-employee directors [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Amortization of expense equally over a service period | 1 year | ||
| Unrecognized compensation expense related to the awards to non-employee directors | $ | $ 450 | ||
| Award to key employees [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted awards (shares) | 49,494 | ||
| Vesting period | 3 years | ||
| Payments Related to Tax Withholding for Share-based Compensation | $ | $ 719 | ||
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period | 3,933 | ||
| Intrinsic value of the SICP awards | $ | $ 10,500 | ||
| Accelerated Vested Shares [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Number Of Multi year Awards | unit | 3 | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | 16,676 | ||
| Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $ | $ 1,100 | ||
| Accelerated Vested Shares [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Shares Paid for Tax Withholding for Share Based Compensation | 10,436 | ||
| Accelerated Vested Shares [Member] | Award to key employees [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | 14,107 | ||
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period | (2,569) | ||
| X | ||||||||||
- Definition Number Of Multi year Awards No definition available.
|
| X | ||||||||||
- Definition Period for amortization of share based expenses. No definition available.
|
| X | ||||||||||
- Definition Share based compensation arrangement by share based payment award equity instruments other than options expired in period. No definition available.
|
| X | ||||||||||
- Definition Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. No definition available.
|
| X | ||||||||||
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Number of shares for which recognition of compensation cost was accelerated. No definition available.
|
| X | ||||||||||
- Definition Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. No definition available.
|
| X | ||||||||||
- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. No definition available.
|
| X | ||||||||||
- Details
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| X | ||||||||||
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Derivative Instruments - Additional Information (Detail) Mcf in Thousands, $ in Thousands, gal in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2018
USD ($)
$ / gal
gal
Mcf
|
Dec. 31, 2017
USD ($)
gal
|
|
| Derivative [Line Items] | ||
| Accounts Receivable Subject to Master Netting Arrangement | $ 1,288 | $ 2,391 |
| Energy Marketing Contracts Assets, Current | 534 | 1,286 |
| Energy Marketing Contract Liabilities, Current | (886) | (6,247) |
| Accounts Payable Subject To Master Netting Arrangement | $ 1,288 | 2,391 |
| Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | Mcf | 500 | |
| Hedging Liability [Member] | Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | $ (779) | (469) |
| Hedging Liability [Member] | Natural Gas Swaps [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | 0 | (2) |
| Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | (120) | |
| Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 324 | 1,181 |
| Energy Marketing Contract Liabilities, Current | (30) | 0 |
| Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contracts Assets, Current | $ 18 | |
| Not Designated as Hedging Instrument [Member] | Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | Mcf | 1,100 | |
| Not Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contracts Assets, Current | $ 90 | |
| Not Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 0 | 13 |
| Not Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities [Member] | Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | $ (77) | $ (5,776) |
| PESCO [Member] | Natural Gas Futures [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | Mcf | 16,900 | |
| 2017 [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | gal | 1.4 | |
| 2017 [Member] | Natural Gas Swaps [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | Mcf | 844 | |
| 2017 [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | gal | 7.7 | |
| Derivative, Cash Received on Hedge | $ 11 | |
| 2017 [Member] | Strike Price 4 [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.5900 | |
| 2017 [Member] | Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Energy Marketing Contracts Assets, Current | $ 306 | |
| 2018 [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Nonmonetary Notional Amount, Volume | gal | 1.4 | |
| 2018 [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Derivative, Cash Received on Hedge | $ 645 | |
| 2018 [Member] | Strike Price Minimum [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.76 | |
| 2018 [Member] | Strike Price 2 [Member] | Propane Swap Agreement [Member] | ||
| Derivative [Line Items] | ||
| Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.875 | |
| Gross [Member] | ||
| Derivative [Line Items] | ||
| Accounts Receivable Subject to Master Netting Arrangement | $ 5,723 | $ 8,283 |
| Accounts Payable Subject To Master Netting Arrangement | 10,326 | 16,643 |
| Net [Member] | ||
| Derivative [Line Items] | ||
| Accounts Receivable Subject to Master Netting Arrangement | 4,435 | 5,892 |
| Accounts Payable Subject To Master Netting Arrangement | $ 9,038 | $ 14,252 |
| X | ||||||||||
- Definition Accounts Payable Subject To Master Netting Arrangement No definition available.
|
| X | ||||||||||
- Definition Accounts Receivable Subject to Master Netting Arrangement No definition available.
|
| X | ||||||||||
- Definition Strike Price Per Gallon For The Propane Swap Agreements No definition available.
|
| X | ||||||||||
- Definition The amount of cash received during the period on settlement of a hedge. No definition available.
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Nominal volume used to calculate payments on a derivative instrument. No definition available.
|
| X | ||||||||||
- Definition Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivative Instruments - Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contracts Assets, Current | $ 534 | $ 1,286 |
| Energy Marketing Contract Liabilities, Current | 886 | 6,247 |
| Mark To Market Energy Assets [Member] | Natural Gas Futures [Member] | Derivatives not designated as hedging instruments [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 90 | |
| Mark To Market Energy Assets [Member] | Natural Gas Futures [Member] | Derivatives designated as hedging instrument [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | 120 | |
| Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | Derivatives not designated as hedging instruments [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 0 | 13 |
| Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | Derivatives designated as hedging instrument [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 324 | 1,181 |
| Energy Marketing Contract Liabilities, Current | 30 | 0 |
| Hedging Asset [Member] | Natural Gas Futures [Member] | Derivatives designated as hedging instrument [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 92 | |
| Energy Marketing Contract Liabilities, Current | 120 | |
| Mark-to-market energy liabilities [Member] | Natural Gas Futures [Member] | Derivatives not designated as hedging instruments [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | 77 | 5,776 |
| Mark-to-market energy liabilities [Member] | Propane Swap Agreement [Member] | Derivatives designated as hedging instrument [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contracts Assets, Current | 18 | |
| Hedging Liability [Member] | Natural Gas Swaps [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | 0 | 2 |
| Hedging Liability [Member] | Natural Gas Futures [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Energy Marketing Contract Liabilities, Current | $ 779 | $ 469 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivative Instruments - Effects of Gains and Losses from Derivative Instruments on Condensed Consolidated Financial Statements (Detail) - USD ($) |
3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | $ 985,000 | $ (224,000) | $ (5,134,000) | $ 2,067,000 | ||||||
| Revenue [Member] | Derivatives not designated as hedging instruments [Member] | Forward Contracts [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | 0 | 0 | [1] | 112,000 | [1] | |||||
| Cost of Sales [Member] | Derivatives not designated as hedging instruments [Member] | Future [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | (128,000) | 497,000 | (2,963,000) | 621,000 | ||||||
| Cost of Sales [Member] | Derivatives not designated as hedging instruments [Member] | Propane Swap Agreement [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | (4,000) | 0 | (13,000) | (4,000) | ||||||
| Cost of Sales [Member] | Derivatives designated as hedging instrument [Member] | Future [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | (161,000) | 631,000 | 137,000 | 1,781,000 | ||||||
| Cost of Sales [Member] | Derivatives designated as hedging instrument [Member] | Swap [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | (31,000) | 0 | (481,000) | 0 | ||||||
| Cost of Sales [Member] | Derivatives designated as hedging instrument [Member] | Propane Swap Agreement [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | (181,000) | 77,000 | (645,000) | 465,000 | ||||||
| Cost of Sales [Member] | Derivatives designated as hedging instrument [Member] | Put/Call Option [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | 0 | 0 | [2] | (9,000) | [2] | |||||
| Other Comprehensive Income (Loss) [Member] | Derivatives designated as hedging instrument [Member] | Natural Gas Swaps [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | 523,000 | 0 | 588,000 | 0 | ||||||
| Other Comprehensive Income (Loss) [Member] | Derivatives designated as hedging instrument [Member] | Propane Swap Agreement [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | 106,000 | (218,000) | (886,000) | (775,000) | ||||||
| Other Comprehensive Income (Loss) [Member] | Derivatives designated as hedging instrument [Member] | Natural Gas Futures [Member] | ||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||||||||
| Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | $ 861,000 | $ (1,211,000) | $ (871,000) | $ (124,000) | ||||||
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Assets: | ||
| Investments | $ 7,486 | $ 6,756 |
| Liabilities: | ||
| Energy Marketing Contract Liabilities, Current | 886 | 6,247 |
| Equity Securities [Member] | ||
| Assets: | ||
| Investments | 21 | 22 |
| Quoted Prices in Active Markets (Level 1) [Member] | ||
| Assets: | ||
| Assets, Fair Value Disclosure | 6,815 | 6,108 |
| Quoted Prices in Active Markets (Level 1) [Member] | Equity Securities [Member] | ||
| Assets: | ||
| Investments | 21 | 22 |
| Quoted Prices in Active Markets (Level 1) [Member] | Investments - other [Member] | ||
| Assets: | ||
| Investments | 6,794 | 6,086 |
| Quoted Prices in Active Markets (Level 1) [Member] | Total Investments [Member] | ||
| Assets: | ||
| Investments | 6,815 | 6,108 |
| Significant Other Observable Inputs (Level 2) [Member] | ||
| Assets: | ||
| Assets, Fair Value Disclosure | 534 | 1,286 |
| Liabilities: | ||
| Energy Marketing Contract Liabilities, Current | 886 | 6,247 |
| Significant Other Observable Inputs (Level 2) [Member] | Mark To Market Energy Assets incl. natural gas and swap agreements[Member] | ||
| Assets: | ||
| Derivative assets | 534 | 1,286 |
| Significant Unobservable Inputs (Level 3) [Member] | ||
| Assets: | ||
| Assets, Fair Value Disclosure | 671 | 648 |
| Significant Unobservable Inputs (Level 3) [Member] | Investments in guaranteed income fund [Member] | ||
| Assets: | ||
| Investments | 671 | 648 |
| Significant Unobservable Inputs (Level 3) [Member] | Total Investments [Member] | ||
| Assets: | ||
| Investments | 671 | 648 |
| Recurring [Member] | ||
| Assets: | ||
| Assets, Fair Value Disclosure | 8,020 | 8,042 |
| Liabilities: | ||
| Energy Marketing Contract Liabilities, Current | 886 | 6,247 |
| Recurring [Member] | Equity Securities [Member] | ||
| Assets: | ||
| Investments | 21 | 22 |
| Recurring [Member] | Investments in guaranteed income fund [Member] | ||
| Assets: | ||
| Investments | 671 | 648 |
| Recurring [Member] | Investments - other [Member] | ||
| Assets: | ||
| Investments | 6,794 | 6,086 |
| Recurring [Member] | Total Investments [Member] | ||
| Assets: | ||
| Investments | 7,486 | 6,756 |
| Recurring [Member] | Mark To Market Energy Assets incl. natural gas and swap agreements[Member] | ||
| Assets: | ||
| Derivative assets | $ 534 | $ 1,286 |
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value of Financial Instruments - Summary of Changes in Fair Value of Investments (Detail) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||
| Beginning Balance | $ 648 | $ 561 |
| Purchases and adjustments | 54 | 65 |
| Transfers | 24 | 0 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (12) | 0 |
| Investment Income | 5 | 4 |
| Ending Balance | $ 671 | $ 630 |
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions |
Jun. 30, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Fair Value Disclosures [Abstract] | ||
| Long-term debt including current maturities | $ 250.7 | $ 205.2 |
| Fair value of long-term debt | $ 250.3 | $ 215.4 |
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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Long-Term Debt - Outstanding Long-Term Debt (Detail) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
||
|---|---|---|---|---|---|
| Debt Instrument [Line Items] | |||||
| Total long-term debt | $ 250,700 | $ 205,200 | |||
| Capital lease obligation | 1,351 | 2,070 | |||
| Total Long-term debt | 251,573 | 206,816 | |||
| Less: current maturities | (9,977) | (9,421) | |||
| Less: debt issuance costs | (488) | (433) | |||
| Total long-term debt, net of current maturities | 241,596 | 197,395 | |||
| 9.08% bond, due June 1, 2022 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | [1] | 7,984 | 7,982 | ||
| 5.50% note, due October 12, 2020 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 6,000 | 6,000 | |||
| 5.93% note, due October 31, 2023 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 16,500 | 18,000 | |||
| 5.68% note, due June 30, 2026 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 23,200 | 26,100 | |||
| Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 7,000 | 7,000 | |||
| Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 20,000 | 20,000 | |||
| Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 50,000 | 50,000 | |||
| 3.25% note, due April 30, 2032 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 70,000 | 70,000 | |||
| 3.48% note, due May 31, 2038 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | 50,000 | ||||
| Revolving Credit Facility [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | $ 25,000 | ||||
| Promissory note [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Total long-term debt | $ 26 | $ 97 | |||
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-Term Debt - Outstanding Long-Term Debt- Supplemental Information (Detail) |
6 Months Ended |
|---|---|
Jun. 30, 2018 | |
| 9.08% bond, due June 1, 2022 [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 9.08% |
| Debt instrument, maturity date | Jun. 01, 2022 |
| 5.50% note, due October 12, 2020 [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 5.50% |
| Debt instrument, maturity date | Oct. 12, 2020 |
| 5.93% note, due October 31, 2023 [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 5.93% |
| Debt instrument, maturity date | Oct. 31, 2023 |
| 5.68% note, due June 30, 2026 [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 5.68% |
| Debt instrument, maturity date | Jun. 30, 2026 |
| Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 6.43% |
| Debt instrument, maturity date | May 02, 2028 |
| Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 3.73% |
| Debt instrument, maturity date | Dec. 16, 2028 |
| Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 3.88% |
| Debt instrument, maturity date | May 15, 2029 |
| Uncollateralized Senior Note Due on Two Thousand Thirty Two [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 3.25% |
| Debt instrument, maturity date | Apr. 30, 2032 |
| Uncollateralized Senior Note Due on Two Thousand Thirty Eight [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | 3.48% |
| Debt instrument, maturity date | May 31, 2038 |
| Revolving Credit Facility [Member] | |
| Debt Instrument [Line Items] | |
| Long-term debt, interest percentage | |
| Debt instrument, maturity date |
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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands |
6 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Nov. 30, 2017 |
|
| Debt Instrument [Line Items] | ||||
| Long-term debt including current maturities | $ 250,700 | $ 205,200 | ||
| Revolving Credit Facility [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Long-term debt including current maturities | $ 25,000 | |||
| Debt Instrument, Interest Rate, Stated Percentage | ||||
| 3.48% note, due May 31, 2038 [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Long-term debt including current maturities | $ 50,000 | |||
| 3.25% note, due April 30, 2032 [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Long-term debt including current maturities | $ 70,000 | $ 70,000 | ||
| Notes Payable, Other Payables [Member] | Shelf Notes [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Debt Instrument, Interest Rate, Stated Percentage | 3.25% | |||
| Prudential [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Senior notes | $ 150,000 | |||
| Prudential [Member] | Notes Payable, Other Payables [Member] | Shelf Notes [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Senior notes | 150,000 | |||
| MetLife [Member] | Notes Payable, Other Payables [Member] | Shelf Notes [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Senior notes | $ 150,000 | |||
| Maturity date term | 20 years | |||
| New York Life [Member] | Notes Payable, Other Payables [Member] | Shelf Notes [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Senior notes | $ 100,000 | |||
| Maturity date term | 20 years | |||
| Prudential and Metlife [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Senior notes | $ 230,000 | |||
| Series A [Member] | New York Life [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Senior notes | $ 50,000 | |||
| Debt Instrument, Interest Rate, Stated Percentage | 3.48% | |||
| Series B [Member] | New York Life [Member] | ||||
| Debt Instrument [Line Items] | ||||
| Debt Instrument, Interest Rate, Stated Percentage | 3.58% |
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