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Derivative Instruments - The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Cash (Paid) Received in Settlement of Commodity Derivative Instruments:	$ (131,091)	$ 90,310	$ (139,045)	$ 383,727
Unrealized (Loss) Gain on Commodity Derivative Instruments:	(1,376,179)	(259,144)	(1,873,669)	(500,722)
(Loss) Gain on Derivative Instruments	(1,507,270)	(168,834)	(2,012,714)	(116,995)
Interest Rate Swap
Derivative [Line Items]
Cash Paid in Settlement of Interest Rate Swaps	(2,154)	(1,257)	(4,621)	(1,850)
Unrealized Gain (Loss) on Interest Rate Swaps	1,416	(152)	6,075	(14,389)
(Loss) Gain on Derivative Instruments	(738)	(1,409)	1,454	(16,239)
Natural Gas | Commodity Swap
Derivative [Line Items]
Cash (Paid) Received in Settlement of Commodity Derivative Instruments:	(161,887)	72,062	(171,829)	382,891
Unrealized (Loss) Gain on Commodity Derivative Instruments:	(1,339,362)	(369,121)	(2,066,509)	(550,694)
(Loss) Gain on Derivative Instruments	(1,501,249)	(297,059)	(2,238,338)	(167,803)
Natural Gas | Basis Swap
Derivative [Line Items]
Cash (Paid) Received in Settlement of Commodity Derivative Instruments:	30,796	18,248	32,784	836
Unrealized (Loss) Gain on Commodity Derivative Instruments:	(36,817)	109,977	192,840	49,972
(Loss) Gain on Derivative Instruments	$ (6,021)	$ 128,225	$ 225,624	$ 50,808

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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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