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Segment Information - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Gain on Commodity Derivative Instruments $ 88,964 $ 47,803 $ 110,587 $ 1,352,442  
Other Revenue and Operating Income 48,484 36,444 145,345 88,614  
Total Revenue and Other Operating Income 424,213 350,506 1,130,208 2,466,181  
Total Operating Expense 318,889 299,943 937,283 892,173  
Earnings (Loss) Before Income Tax 82,561 19,242 73,637 1,583,920  
Segment Assets 8,538,049 8,492,637 8,538,049 8,492,637 $ 8,626,657
Depreciation, Depletion and Amortization 121,227 111,855 357,418 320,758  
Capital Expenditures 114,737 205,642 434,837 571,655  
Investments in unconsolidated equity affiliates 18,369 12,408 18,369 12,408  
Citadel Energy Marketing, LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income   42,766   124,195  
NRG Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income   35,095   121,844  
Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 259,459 255,124 821,664 967,823  
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income 30,665        
Natural Gas, NGLs and Oil Revenue | NRG Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income     95,194    
Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 27,306 11,135 52,612 57,302  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 304,805 282,642 924,651 1,075,290  
Other Revenue and Operating Income 24,898        
Operating Segments | Shale          
Segment Reporting Information [Line Items]          
Gain on Commodity Derivative Instruments 87,502 94,520 240,200 111,706  
Other Revenue and Operating Income 18,040 16,383 50,375 50,165  
Total Revenue and Other Operating Income 342,945 338,324 1,036,338 1,030,682  
Total Operating Expense 197,844 192,012 587,065 551,631  
Earnings (Loss) Before Income Tax 145,101 146,312 449,273 479,051  
Segment Assets 6,663,892 6,641,021 6,663,892 6,641,021  
Depreciation, Depletion and Amortization 101,136 94,660 298,521 269,586  
Capital Expenditures 105,133 188,798 396,924 534,432  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 237,403 227,421 745,763 868,811  
Operating Segments | Shale | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Coalbed Methane          
Segment Reporting Information [Line Items]          
Gain on Commodity Derivative Instruments 7,121 7,314 19,082 8,644  
Other Revenue and Operating Income 0 0 0 0  
Total Revenue and Other Operating Income 28,975 34,843 94,284 106,843  
Total Operating Expense 38,101 35,742 112,248 106,181  
Earnings (Loss) Before Income Tax (9,126) (899) (17,964) 662  
Segment Assets 932,410 946,034 932,410 946,034  
Depreciation, Depletion and Amortization 15,025 12,498 43,885 37,530  
Capital Expenditures 7,389 9,655 23,817 26,744  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 21,854 27,529 75,202 98,199  
Operating Segments | Coalbed Methane | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Enviromental Attributes          
Segment Reporting Information [Line Items]          
Other Revenue and Operating Income   14,837 70,544 22,823  
Other          
Segment Reporting Information [Line Items]          
Gain on Commodity Derivative Instruments (5,659) (54,031) (148,695) 1,232,092  
Other Revenue and Operating Income 30,444 20,061 94,970 38,449  
Total Revenue and Other Operating Income 52,293 (22,661) (414) 1,328,656  
Total Operating Expense 82,944 72,189 237,970 234,361  
Earnings (Loss) Before Income Tax (53,414) (126,171) (357,672) 1,104,207  
Segment Assets 941,747 905,582 941,747 905,582  
Depreciation, Depletion and Amortization 5,066 4,697 15,012 13,642  
Capital Expenditures 2,215 7,189 14,096 10,479  
Equity in earnings (loss) of unconsolidated affiliates 529 246 1,006 1,694  
Other | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 202 174 699 813  
Other | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues $ 27,306 $ 11,135 $ 52,612 $ 57,302