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Derivative Instruments - Effect of Derivative Instrument on Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	$ 461,217	$ 69,780	$ (69,720)
Unrealized (Loss) Gain on Commodity Derivative Instruments:	(288,235)	306,325	39,508
Gain (Loss) on Commodity Derivative Instruments	172,982	376,105	(30,212)
Cash (Paid) Received in Settlement of Interest Rate Swaps	(3,141)	223
Unrealized Loss on Interest Rate Swaps	(13,051)	(1,219)
Basis Swaps
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	70,670	(13,119)	(28,622)
Unrealized (Loss) Gain on Commodity Derivative Instruments:	119,073	(100,147)	6,482
Gain (Loss) on Commodity Derivative Instruments	189,743	(113,266)	(22,140)
Interest Rate Swaps
Derivative [Line Items]
Gain (Loss) on Commodity Derivative Instruments	(16,192)	(996)
Natural Gas Revenue | Commodity Swaps
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments:	390,547	82,899	(41,098)
Unrealized (Loss) Gain on Commodity Derivative Instruments:	(407,308)	406,472	33,026
Gain (Loss) on Commodity Derivative Instruments	$ (16,761)	$ 489,371	$ (8,072)

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Gain (loss) incurred in hedging activities.

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The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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