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Derivative Instruments - The Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments	$ 2,405	$ 151,161
Unrealized (Loss) Gain on Commodity Derivative Instruments	31,009	(36,019)
Gain (Loss) on Hedging Activity	33,414	115,142
Interest Rate Swap
Derivative [Line Items]
Cash Paid in Settlement of Interest Rate Swaps	(1,227)	(57)
Unrealized Gain (Loss) on Interest Rate Swaps	4,194	(10,639)
Gain (Loss) on Hedging Activity	2,967	(10,696)
Natural Gas | Commodity Swap
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments	6,550	157,579
Unrealized (Loss) Gain on Commodity Derivative Instruments	(97,459)	545
Gain (Loss) on Hedging Activity	(90,909)	158,124
Natural Gas | Basis Swap
Derivative [Line Items]
Cash Received (Paid) in Settlement of Commodity Derivative Instruments	(4,145)	(6,418)
Unrealized (Loss) Gain on Commodity Derivative Instruments	128,468	(36,564)
Gain (Loss) on Hedging Activity	$ 124,323	$ (42,982)

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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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