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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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For an unclassified balance sheet, the amount of fees and other revenue, excluding investment income receivable, earned but not yet received, which were recognized in conformity with revenue recognition criteria based on estimates or specific contractual terms.

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The net amount of operating interest income (expense).

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Amount awarded from other party in judgment or settlement of litigation.

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Amount, including 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.

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All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax.

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Contingencies (Details)				2 Months Ended	3 Months Ended		4 Months Ended	19 Months Ended
Contingencies (Details)	Jun. 20, 2019 USD ($)	Feb. 01, 2018 MMBTU / d	Jan. 31, 2018 MMBTU / d	Jan. 31, 2018 MMBTU / d	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Nov. 30, 2017 MMBTU / d	Jul. 31, 2017 MMBTU / d	Dec. 31, 2019 USD ($)	Nov. 30, 2018 MMBTU / d	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Contingencies
Revenue					$ 750,474,000	$ 1,114,668,000
Production and ad valorem taxes					25,699,000	35,678,000
Interest					(53,102,000)	(71,950,000)
Accrued revenue					201,320,000				$ 317,886,000
Accounts receivable					91,944,000				$ 46,419,000
Natural gas sales
Contingencies
Revenue					411,082,000	$ 657,266,000
Doddridge County, Tyler County and Ritchie County, West Virginia \| Minimum
Contingencies
Settlement amount					$ 100,000
WGL
Contingencies
Natural gas long term purchase contract volume increase after specified events (in MMBtu)/day \| MMBTU / d										530,000
Damages awarded	$ 96,000,000
WGL \| Pending Litigation
Contingencies
Damages sought											$ 40,000,000
WGL \| Pending Litigation \| Minimum
Contingencies
Damages sought												$ 30,000,000
WGL - Braxton, West Virginia
Contingencies
Natural gas long term purchase contract volume (in MMBtu)/day \| MMBTU / d		200,000	500,000
WGL - Loudoun County, Virginia
Contingencies
Natural gas long term purchase contract volume increase after specified events (in MMBtu)/day \| MMBTU / d										330,000
Potential Positive Outcome of Litigation \| WGL
Contingencies
Natural gas long term purchase contract volume (in MMBtu)/day \| MMBTU / d				500,000			600,000	500,000