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Supplemental Gas Data (unaudited) - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Extractive Industries [Abstract]
Natural Gas, NGLs and Oil Revenue		$ 2,183,929	$ 896,745	$ 1,364,325
Realized (Loss) Gain on Commodity Derivative Instruments		(539,016)	461,217	69,780
Unrealized (Loss) Gain on Commodity Derivative Instruments		(1,093,717)	(288,235)	306,325
Purchased Gas Revenue		99,713	105,792	94,027
Total Revenue		650,909	1,175,519	1,834,457
Lease Operating Expense		46,256	40,407	65,443
Production, Ad Valorem and Other Fees		34,051	24,196	27,461
Transportation, Gathering and Compression		343,635	285,683	330,539
Purchased Gas Costs		93,776	100,902	90,553
Impairment of Exploration and Production Properties	$ 327,400	0	61,849	327,400
Impairment of Unproved Properties and Expirations		0	0	119,429
Exploration Costs		20,626	14,994	44,380
Depreciation, Depletion and Amortization		515,118	501,821	508,463
Total Costs		1,053,462	1,029,852	1,513,668
Pre-tax Operating (Loss) Income		(402,553)	145,667	320,789
Income Tax (Benefit) Expense		(87,354)	42,098	149,167
Results of Operations for Producing Activities excluding Corporate and Interest Costs		$ (315,199)	$ 103,569	$ 171,622

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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