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Segment Information - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments $ 7,528 $ 762,167  
Other Revenue and Operating Income 36,776 21,359  
Total Revenue and Other Operating Income 384,553 1,275,977  
Total Operating Expense 318,851 320,599  
Earnings (Loss) Before Income Tax 6,319 927,956  
Segment Assets 8,656,642 8,340,145 $ 8,626,657
Depreciation, Depletion and Amortization 118,650 105,222  
Capital Expenditures 168,184 170,028  
Investments in unconsolidated equity affiliates 13,631 11,828  
Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income   55,101  
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 325,972 455,639  
Natural Gas, NGLs and Oil Revenue | Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income 42,909    
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 14,277 36,812  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 356,143 509,205  
Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments 50,779 (56,336)  
Other Revenue and Operating Income 15,894 16,754  
Total Revenue and Other Operating Income 359,435 367,616  
Total Operating Expense 198,106 188,117  
Earnings (Loss) Before Income Tax 161,329 179,499  
Segment Assets 6,667,562 6,536,697  
Depreciation, Depletion and Amortization 99,476 88,110  
Capital Expenditures 152,874 159,349  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 292,762 407,198  
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 on Commodity Derivative Instruments 3,846 (4,672)  
Other Revenue and Operating Income 0 0  
Total Revenue and Other Operating Income 36,709 43,364  
Total Operating Expense 37,004 36,420  
Earnings (Loss) Before Income Tax (295) 6,944  
Segment Assets 939,781 955,280  
Depreciation, Depletion and Amortization 14,273 12,447  
Capital Expenditures 8,668 9,459  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 32,863 48,036  
Operating Segments | Coalbed Methane | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 0 0  
Operating Segments | Enviromental Attributes      
Segment Reporting Information [Line Items]      
Other Revenue and Operating Income 12,769    
Other      
Segment Reporting Information [Line Items]      
Gain on Commodity Derivative Instruments (47,097) 823,175  
Other Revenue and Operating Income 20,882 4,605  
Total Revenue and Other Operating Income (11,591) 864,997  
Total Operating Expense 83,741 96,062  
Earnings (Loss) Before Income Tax (154,715) 741,513  
Segment Assets 1,049,299 848,168  
Depreciation, Depletion and Amortization 4,901 4,665  
Capital Expenditures 6,642 1,220  
Equity in earnings (loss) of unconsolidated affiliates 250 114  
Other | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: 347 405  
Other | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue from Contracts with Customers: $ 14,277 $ 36,812