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SEGMENT INFORMATION - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments $ 131,695 $ 88,964 $ 24,596 $ 110,587  
Other Revenue and Operating Income 42,129 48,484 135,956 145,345  
Total Revenue and Other Operating Income 583,840 424,213 1,628,650 1,130,208  
Lease Operating Expense 27,127 17,253 76,715 52,798  
Production, Ad Valorem and Other Fees 7,725 6,646 24,666 20,909  
Depreciation, Depletion and Amortization 149,323 121,227 428,979 357,418  
Interest Expense 42,964 37,923 128,616 113,997  
Other Segment Items (6,044) 62,329 101,974 226,816  
Total Costs and Expenses 318,148 341,652 1,050,115 1,056,571  
Income (Loss) Before Income Tax 265,692 82,561 578,535 73,637  
Segment Assets 8,904,118 8,538,049 8,904,118 8,538,049 $ 8,511,903
Capital Expenditures 75,544 114,737 320,574 434,837  
Investments in unconsolidated equity affiliates 17,881 18,369 17,881 18,369  
NRG Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income       95,194  
Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 400,990 259,459 1,437,113 821,664  
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC          
Segment Reporting Information [Line Items]          
Revenues 43,010   167,758    
Total Revenue and Other Operating Income   30,665      
Natural Gas, NGLs and Oil Revenue | NRG Business Marketing LLC          
Segment Reporting Information [Line Items]          
Revenues 47,915   151,213    
Natural Gas, NGLs and Oil Revenue | DTE Energy Trading, Inc.          
Segment Reporting Information [Line Items]          
Revenues 49,542   154,654    
Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 9,026 27,306 30,985 52,612  
Transportation, Gathering and Compression          
Segment Reporting Information [Line Items]          
Transportation, Gathering and Compression 97,053 96,274 289,165 284,633  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 427,431 304,805 1,519,783 924,651  
Operating Segments | Enviromental Attributes          
Segment Reporting Information [Line Items]          
Other Revenue and Operating Income 17,949        
Operating Segments | Shale          
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 21,014 87,502 (114,942) 240,200  
Other Revenue and Operating Income 17,415 18,040 51,685 50,375  
Total Revenue and Other Operating Income 405,744 342,945 1,263,231 1,036,338  
Lease Operating Expense 20,972 11,755 58,405 36,233  
Production, Ad Valorem and Other Fees 6,180 5,355 19,889 16,700  
Depreciation, Depletion and Amortization 127,334 101,135 364,962 298,521  
Interest Expense 0 0 0 0  
Other Segment Items 0 0 0 0  
Total Costs and Expenses 234,967 197,844 681,836 587,065  
Income (Loss) Before Income Tax 170,777 145,101 581,395 449,273  
Segment Assets 7,152,404 6,663,892 7,152,404 6,663,892  
Capital Expenditures 67,428 105,133 280,663 396,924  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 367,315 237,403 1,326,488 745,763  
Operating Segments | Shale | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Shale | Transportation, Gathering and Compression          
Segment Reporting Information [Line Items]          
Transportation, Gathering and Compression 80,481 79,599 238,580 235,611  
Operating Segments | Coalbed Methane          
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 1,358 7,121 (7,728) 19,082  
Other Revenue and Operating Income 0 0 0 0  
Total Revenue and Other Operating Income 34,103 28,975 101,475 94,284  
Lease Operating Expense 6,298 5,456 18,283 16,194  
Production, Ad Valorem and Other Fees 1,477 1,278 4,695 4,165  
Depreciation, Depletion and Amortization 15,096 15,024 43,714 43,885  
Interest Expense 0 0 0  
Other Segment Items 0 0 0 0  
Total Costs and Expenses 39,066 38,101 115,997 112,248  
Income (Loss) Before Income Tax (4,963) (9,126) (14,522) (17,964)  
Segment Assets 915,031 932,410 915,031 932,410  
Capital Expenditures 6,258 7,389 35,506 23,817  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 32,745 21,854 109,203 75,202  
Operating Segments | Coalbed Methane | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Coalbed Methane | Transportation, Gathering and Compression          
Segment Reporting Information [Line Items]          
Transportation, Gathering and Compression 16,195 16,343 49,305 48,004  
Other          
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 109,323 (5,659) 147,266 (148,695)  
Other Revenue and Operating Income 24,714 30,444 84,271 94,970  
Total Revenue and Other Operating Income 143,993 52,293 263,944 (414)  
Lease Operating Expense (143) 42 27 371  
Production, Ad Valorem and Other Fees 68 13 82 44  
Depreciation, Depletion and Amortization 6,893 5,068 20,303 15,012  
Interest Expense 42,964 37,923 128,616 113,997  
Other Segment Items (6,044) 62,329 101,974 226,816  
Total Costs and Expenses 44,115 105,707 252,282 357,258  
Income (Loss) Before Income Tax 99,878 (53,414) 11,662 (357,672)  
Equity in earnings (loss) of unconsolidated affiliates (1,297) (529) (749) (1,006)  
Segment Assets 836,683 941,747 836,683 941,747  
Capital Expenditures 1,858 2,215 4,405 14,096  
Other | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 930 202 1,422 699  
Other | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 9,026 27,306 30,985 52,612  
Other | Transportation, Gathering and Compression          
Segment Reporting Information [Line Items]          
Transportation, Gathering and Compression $ 377 332 1,280 1,018  
Other | Enviromental Attributes          
Segment Reporting Information [Line Items]          
Other Revenue and Operating Income   $ 24,898 $ 61,234 $ 70,544