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SEGMENT INFORMATION - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments $ 421,121 $ 14,095 $ (107,099) $ 21,623  
Other Revenue and Operating Income 45,864 60,086 93,828 96,861  
Total Revenue and Other Operating Income 962,422 321,443 1,044,811 705,995  
Lease Operating Expense 26,256 17,819 49,588 35,545  
Production, Ad Valorem and Other Fees 9,668 6,638 16,941 14,263  
Depreciation, Depletion and Amortization 152,595 117,541 279,657 236,191  
Interest Expense 44,041 38,634 85,652 76,075  
Other Segment Items 47,268 64,345 108,019 164,486  
Total Costs and Expenses 376,781 336,686 731,969 714,919  
Income (Loss) Before Income Tax 585,641 (15,243) 312,842 (8,924)  
Segment Assets 8,987,867 8,602,954 8,987,867 8,602,954 $ 8,511,903
Capital Expenditures 113,565 151,916 245,030 320,100  
Investments in unconsolidated equity affiliates 19,178 15,394 19,178 15,394  
NRG Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating Income       67,854  
Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 485,029 236,233 1,036,123 562,205  
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC          
Segment Reporting Information [Line Items]          
Revenues 59,948   124,748    
Total Revenue and Other Operating Income   28,684      
Natural Gas, NGLs and Oil Revenue | NRG Business Marketing LLC          
Segment Reporting Information [Line Items]          
Revenues 58,792        
Natural Gas, NGLs and Oil Revenue | DTE Energy Trading, Inc.          
Segment Reporting Information [Line Items]          
Revenues 56,365        
Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 10,408 11,029 21,959 25,306  
Transportation, Gathering and Compression          
Segment Reporting Information [Line Items]          
Transportation, Gathering and Compression 96,953 91,709 192,112 188,359  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 512,869 263,703 1,092,352 619,846  
Operating Segments | Enviromental Attributes          
Segment Reporting Information [Line Items]          
Other Revenue and Operating Income 20,400        
Operating Segments | Shale          
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments (33,256) 101,919 (135,956) 152,698  
Other Revenue and Operating Income 17,432 16,441 34,270 32,335  
Total Revenue and Other Operating Income 435,794 333,958 857,487 693,393  
Lease Operating Expense 20,214 12,309 37,433 24,478  
Production, Ad Valorem and Other Fees 8,209 5,411 13,709 11,345  
Depreciation, Depletion and Amortization 131,268 97,909 237,628 197,386  
Interest Expense 0 0 0 0  
Other Segment Items 0 0 0 0  
Total Costs and Expenses 239,740 191,115 446,869 389,221  
Income (Loss) Before Income Tax 196,054 142,843 410,618 304,172  
Segment Assets 7,143,060 6,676,756 7,143,060 6,676,756  
Capital Expenditures 85,556 138,917 213,235 291,791  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 451,618 215,598 959,173 508,360  
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 80,049 75,486 158,099 156,012  
Operating Segments | Coalbed Methane          
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments (2,133) 8,115 (9,086) 11,961  
Other Revenue and Operating Income 0 0 0 0  
Total Revenue and Other Operating Income 31,047 28,600 67,372 65,309  
Lease Operating Expense 6,016 5,363 11,985 10,738  
Production, Ad Valorem and Other Fees 1,452 1,213 3,218 2,888  
Depreciation, Depletion and Amortization 14,806 14,588 28,618 28,860  
Interest Expense 0 0 0 0  
Other Segment Items 0 0 0 0  
Total Costs and Expenses 38,601 37,143 76,931 74,147  
Income (Loss) Before Income Tax (7,554) (8,543) (9,559) (8,838)  
Segment Assets 923,635 939,831 923,635 939,831  
Capital Expenditures 26,505 7,760 29,248 16,428  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 33,180 20,485 76,458 53,348  
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 16,327 15,979 33,110 31,661  
Other          
Segment Reporting Information [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 456,510 (95,939) 37,943 (143,036)  
Other Revenue and Operating Income 28,432 43,645 59,558 64,526  
Total Revenue and Other Operating Income 495,581 (41,115) 119,952 (52,707)  
Lease Operating Expense 26 147 170 329  
Production, Ad Valorem and Other Fees 7 14 14 30  
Depreciation, Depletion and Amortization 6,521 5,044 13,411 9,945  
Interest Expense 44,041 38,634 85,652 76,075  
Other Segment Items 47,268 64,345 108,019 164,486  
Total Costs and Expenses 98,440 108,428 208,169 251,551  
Income (Loss) Before Income Tax 397,141 (149,543) (88,217) (304,258)  
Equity in earnings (loss) of unconsolidated affiliates 605 227 548 477  
Segment Assets 921,172 986,367 921,172 986,367  
Capital Expenditures 1,504 5,239 2,547 11,881  
Other | Natural Gas, NGLs and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenues 231 150 492 497  
Other | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenues 10,408 11,029 21,959 25,306  
Other | Transportation, Gathering and Compression          
Segment Reporting Information [Line Items]          
Transportation, Gathering and Compression 577 244 $ 903 686  
Other | Enviromental Attributes          
Segment Reporting Information [Line Items]          
Other Revenue and Operating Income $ 43,285 $ 32,877   $ 45,646