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Segment Information - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments $ 47,803 $ (1,062,353) $ 1,352,442 $ (3,441,389)  
Other Revenue and Operating Income 36,444 20,335 88,614 66,267  
Total Revenue and Other Operating Income (Loss) 350,506 117,061 2,466,181 (375,619)  
Total Operating Expense 299,943 325,473 892,173 978,468  
Earnings Before Income Tax 19,242 (266,715) 1,583,920 (1,468,297)  
Segment Assets 8,492,637 8,633,126 8,492,637 8,633,126 $ 8,515,773
Depreciation, Depletion and Amortization 111,855 114,167 320,758 348,970  
Capital Expenditures 205,642 133,553 571,655 392,537  
Investments in unconsolidated equity affiliates 12,408 13,332 12,408 13,332  
Direct Energy Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income (Loss)       351,649  
Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 255,124 1,127,341 967,823 2,875,371  
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income (Loss) 42,766   124,195    
Natural Gas, NGLs and Oil Revenue | Direct Energy Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income (Loss) 35,095 138,349 121,844    
Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 11,135 31,738 57,302 124,132  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 282,642 1,175,467 1,075,290 3,051,538  
Operating Segments | Shale          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments 94,520 (601,979) 111,706 (1,340,463)  
Other Revenue and Operating Income 16,383 16,388 50,165 52,035  
Total Revenue and Other Operating Income (Loss) 338,324 444,263 1,030,682 1,345,506  
Total Operating Expense 192,012 205,866 551,631 593,179  
Earnings Before Income Tax 146,312 238,397 479,051 752,327  
Segment Assets 6,641,021 6,397,404 6,641,021 6,397,404  
Depreciation, Depletion and Amortization 94,660 97,121 269,586 294,475  
Capital Expenditures 188,798 129,302 534,432 379,381  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 227,421 1,029,854 868,811 2,633,934  
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]          
Gain (Loss) on Commodity Derivative Instruments 7,314 (48,945) 8,644 (111,446)  
Other Revenue and Operating Income 0 0 0 0  
Total Revenue and Other Operating Income (Loss) 34,843 47,415 106,843 127,870  
Total Operating Expense 35,742 33,399 106,181 95,449  
Earnings Before Income Tax (899) 14,016 662 32,421  
Segment Assets 946,034 1,269,492 946,034 1,269,492  
Depreciation, Depletion and Amortization 12,498 12,946 37,530 39,222  
Capital Expenditures 9,655 3,038 26,744 8,959  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 27,529 96,360 98,199 239,316  
Operating Segments | Coalbed Methane | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 0 0 0 0  
Operating Segments | Enviromental Attributes          
Segment Reporting Information [Line Items]          
Other Revenue and Operating Income 14,837   22,823    
Other          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments (54,031) (411,429) 1,232,092 (1,989,480)  
Other Revenue and Operating Income 20,061 3,947 38,449 14,232  
Total Revenue and Other Operating Income (Loss) (22,661) (374,617) 1,328,656 (1,848,995)  
Total Operating Expense 72,189 86,208 234,361 289,840  
Earnings Before Income Tax (126,171) (519,128) 1,104,207 (2,253,045)  
Segment Assets 905,582 966,230 905,582 966,230  
Depreciation, Depletion and Amortization 4,697 4,100 13,642 15,273  
Capital Expenditures 7,189 1,213 10,479 4,197  
Equity in earnings (loss) of unconsolidated affiliates 246 854 1,694 3,031  
Other | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 174 1,127 813 2,121  
Other | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: $ 11,135 $ 31,738 $ 57,302 $ 124,132