Segment Information - Industry Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Loss on Commodity Derivative Instruments	$ (1,062,353)	$ (1,507,270)	$ (3,441,389)	$ (2,012,714)
Other Revenue and Operating Income	20,335	24,783	66,267	75,227
Total Revenue and Other Operating Income (Loss)	117,061	(880,261)	(375,619)	(534,399)
Total Operating Expense	325,473	304,858	978,468	885,372
Earnings (Loss) Before Income Tax	(266,715)	(1,232,447)	(1,468,297)	(1,543,220)
Segment Assets	8,633,126	8,228,153	8,633,126	8,228,153	$ 8,100,751
Depreciation, Depletion and Amortization	114,167	129,734	348,970	381,284
Capital Expenditures	133,553	96,763	392,537	349,150
Investments in unconsolidated equity affiliates	13,332	17,020	13,332	17,020
Natural Gas, NGLs and Oil Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	1,127,341	585,915	2,875,371	1,336,588
Natural Gas, NGLs and Oil Revenue | Direct Energy Business Marketing LLC
Segment Reporting Information [Line Items]
Total Revenue and Other Operating Income (Loss)	138,349		351,649
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC
Segment Reporting Information [Line Items]
Total Revenue and Other Operating Income (Loss)		93,499		193,964
Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	31,738	16,311	124,132	66,500
Operating Segments
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	1,175,467	621,276	3,051,538	1,459,883
Operating Segments | Shale
Segment Reporting Information [Line Items]
Loss on Commodity Derivative Instruments	(601,979)	(119,429)	(1,340,463)	(126,641)
Other Revenue and Operating Income	16,388	19,050	52,035	56,795
Total Revenue and Other Operating Income (Loss)	444,263	436,033	1,345,506	1,141,393
Total Operating Expense	205,866	206,703	593,179	587,409
Earnings (Loss) Before Income Tax	238,397	229,330	752,327	553,984
Segment Assets	6,397,404	6,076,533	6,397,404	6,076,533
Depreciation, Depletion and Amortization	97,121	111,643	294,475	325,529
Capital Expenditures	129,302	94,317	379,381	342,665
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	1,029,854	536,412	2,633,934	1,211,239
Operating Segments | Shale | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	0	0	0	0
Operating Segments | Coalbed Methane
Segment Reporting Information [Line Items]
Loss on Commodity Derivative Instruments	(48,945)	(11,620)	(111,446)	(12,359)
Other Revenue and Operating Income	0	0	0	0
Total Revenue and Other Operating Income (Loss)	47,415	37,487	127,870	112,157
Total Operating Expense	33,399	30,124	95,449	86,883
Earnings (Loss) Before Income Tax	14,016	7,363	32,421	25,274
Segment Assets	1,269,492	1,057,543	1,269,492	1,057,543
Depreciation, Depletion and Amortization	12,946	14,031	39,222	43,779
Capital Expenditures	3,038	2,105	8,959	5,749
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	96,360	49,107	239,316	124,516
Operating Segments | Coalbed Methane | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	0	0	0	0
Other
Segment Reporting Information [Line Items]
Loss on Commodity Derivative Instruments	(411,429)	(1,376,221)	(1,989,480)	(1,873,714)
Other Revenue and Operating Income	3,947	5,733	14,232	18,432
Total Revenue and Other Operating Income (Loss)	(374,617)	(1,353,781)	(1,848,995)	(1,787,949)
Total Operating Expense	86,208	68,031	289,840	211,080
Earnings (Loss) Before Income Tax	(519,128)	(1,469,140)	(2,253,045)	(2,122,478)
Segment Assets	966,230	1,094,077	966,230	1,094,077
Depreciation, Depletion and Amortization	4,100	4,060	15,273	11,976
Capital Expenditures	1,213	341	4,197	736
Equity in earnings (loss) of unconsolidated affiliates	854	995	3,031	3,499
Other | Natural Gas, NGLs and Oil Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	1,127	396	2,121	833
Other | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers:	$ 31,738	$ 16,311	$ 124,132	$ 66,500