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Segment Information - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments $ 762,167 $ (1,726,394)  
Other Revenue and Operating Income 21,359 22,830  
Total Revenue and Other Operating Income (Loss) 1,275,977 (913,098)  
Total Operating Expense 320,599 322,469  
Earnings Before Income Tax 927,956 (1,248,505)  
Segment Assets 8,340,145 8,223,524 $ 8,515,773
Depreciation, Depletion and Amortization 105,222 118,623  
Capital Expenditures 170,028 122,316  
Investments in unconsolidated equity affiliates 11,828 15,602  
Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income (Loss) 91,992    
Citadel Energy Marketing, LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income (Loss) 86,564    
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 455,639 744,625  
Natural Gas, NGLs and Oil Revenue | Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income (Loss) 55,101    
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 36,812 45,841  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 509,205 808,123  
Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments (56,336) (249,458)  
Other Revenue and Operating Income 16,754 17,657  
Total Revenue and Other Operating Income (Loss) 367,616 449,010  
Total Operating Expense 188,117 197,429  
Earnings Before Income Tax 179,499 251,581  
Segment Assets 6,536,697 6,020,173  
Depreciation, Depletion and Amortization 88,110 101,444  
Capital Expenditures 159,349 118,800  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 407,198 680,811  
Operating Segments | Shale | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 0 0  
Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments (4,672) (21,280)  
Other Revenue and Operating Income 0 0  
Total Revenue and Other Operating Income (Loss) 43,364 42,093  
Total Operating Expense 36,420 30,580  
Earnings Before Income Tax 6,944 11,513  
Segment Assets 955,280 1,032,602  
Depreciation, Depletion and Amortization 12,447 13,239  
Capital Expenditures 9,459 2,395  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 48,036 63,373  
Operating Segments | Coalbed Methane | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 0 0  
Other      
Segment Reporting Information [Line Items]      
Gain (Loss) on Commodity Derivative Instruments 823,175 (1,455,656)  
Other Revenue and Operating Income 4,605 5,173  
Total Revenue and Other Operating Income (Loss) 864,997 (1,404,201)  
Total Operating Expense 96,062 94,460  
Earnings Before Income Tax 741,513 (1,511,599)  
Segment Assets 848,168 1,170,749  
Depreciation, Depletion and Amortization 4,665 3,940  
Capital Expenditures 1,220 1,121  
Equity in earnings (loss) of unconsolidated affiliates 114 800  
Other | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 405 441  
Other | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: $ 36,812 $ 45,841