v3.26.1
SEGMENT INFORMATION - Schedule of Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
(Loss) Gain on Commodity Derivative Instruments $ 176,336 $ 421,121 $ 180,317 $ (107,099)  
Other Revenue and Operating Income 40,257 45,864 88,200 93,828  
Total Revenue and Other Operating Income 618,484 962,422 1,405,138 1,044,811  
Lease Operating Expense 21,262 26,256 43,032 49,588  
Production, Ad Valorem and Other Fees 6,546 9,668 15,335 16,941  
Depreciation, Depletion and Amortization 136,232 152,595 270,845 279,657  
Interest Expense 39,023 44,041 79,493 85,652  
Other Segment Items 75,256 47,268 125,461 108,019  
Total Costs and Expenses 381,542 376,781 739,791 731,969  
Income (Loss) Before Income Tax 236,942 585,641 665,347 312,842  
Segment Assets 9,136,899 8,987,867 9,136,899 8,987,867 $ 9,094,446
Capital Expenditures 142,000 113,565 311,906 245,030  
Investments in unconsolidated equity affiliates 5,166 19,178 5,166 19,178  
Natural Gas, NGLs and Oil Revenue          
Segment Reporting [Line Items]          
Revenues 389,435 485,029 1,111,478 1,036,123  
Natural Gas, NGLs and Oil Revenue | NRG Business Marketing LLC          
Segment Reporting [Line Items]          
Revenues 57,547 58,792 213,561    
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC          
Segment Reporting [Line Items]          
Revenues   59,948   124,748  
Natural Gas, NGLs and Oil Revenue | DTE Energy Trading, Inc.          
Segment Reporting [Line Items]          
Revenues   56,365 118,454    
Purchased Gas Revenue          
Segment Reporting [Line Items]          
Revenues 12,456 10,408 25,143 21,959  
Transportation, Gathering and Compression          
Segment Reporting [Line Items]          
Transportation, Gathering and Compression 103,223 96,953 205,625 192,112  
Operating Segments          
Segment Reporting [Line Items]          
Revenues 417,173 512,869 1,168,272 1,092,352  
Operating Segments | Shale          
Segment Reporting [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 42,388 (33,256) (165,952) (135,956)  
Other Revenue and Operating Income 15,282 17,432 31,651 34,270  
Total Revenue and Other Operating Income 418,232 435,794 889,161 857,487  
Lease Operating Expense 14,564 20,214 30,106 37,433  
Production, Ad Valorem and Other Fees 4,952 8,209 11,516 13,709  
Depreciation, Depletion and Amortization 114,559 131,268 227,523 237,628  
Interest Expense 0 0 0 0  
Other Segment Items 0 0 0    
Total Costs and Expenses 220,758 239,740 442,604 446,869  
Income (Loss) Before Income Tax 197,474 196,054 446,557 410,618  
Segment Assets 7,291,994 7,143,060 7,291,994 7,143,060  
Capital Expenditures 134,119 85,556 297,539 213,235  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue          
Segment Reporting [Line Items]          
Revenues 360,562 451,618 1,023,462 959,173  
Operating Segments | Shale | Purchased Gas Revenue          
Segment Reporting [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Shale | Transportation, Gathering and Compression          
Segment Reporting [Line Items]          
Transportation, Gathering and Compression 86,683 80,049 173,459 158,099  
Operating Segments | Coalbed Methane          
Segment Reporting [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 3,037 (2,133) (10,160) (9,086)  
Other Revenue and Operating Income 0 0 0 0  
Total Revenue and Other Operating Income 31,670 31,047 77,234 67,372  
Lease Operating Expense 6,290 6,016 12,316 11,985  
Production, Ad Valorem and Other Fees 1,584 1,452 3,796 3,218  
Depreciation, Depletion and Amortization 14,874 14,806 29,290 28,618  
Interest Expense 0 0 0 0  
Other Segment Items 0 0 0    
Total Costs and Expenses 37,947 38,601 76,596 76,931  
Income (Loss) Before Income Tax (6,277) (7,554) 638 (9,559)  
Segment Assets 885,981 923,635 885,981 923,635  
Capital Expenditures 6,286 26,505 11,686 29,248  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue          
Segment Reporting [Line Items]          
Revenues 28,633 33,180 87,394 76,458  
Operating Segments | Coalbed Methane | Purchased Gas Revenue          
Segment Reporting [Line Items]          
Revenues 0 0 0 0  
Operating Segments | Coalbed Methane | Transportation, Gathering and Compression          
Segment Reporting [Line Items]          
Transportation, Gathering and Compression 15,199 16,327 31,194 33,110  
Other          
Segment Reporting [Line Items]          
(Loss) Gain on Commodity Derivative Instruments 130,911 456,510 356,429 37,943  
Other Revenue and Operating Income 24,975 28,432 56,549 59,558  
Total Revenue and Other Operating Income 168,582 495,581 438,743 119,952  
Lease Operating Expense 408 26 610 170  
Production, Ad Valorem and Other Fees 10 7 23 14  
Depreciation, Depletion and Amortization 6,799 6,521 14,032 13,411  
Interest Expense 39,023 44,041 79,493 85,652  
Other Segment Items 75,256 47,268 125,461 108,019  
Total Costs and Expenses 122,837 98,440 220,591 208,169  
Income (Loss) Before Income Tax 45,745 397,141 218,152 (88,217)  
Equity in earnings (loss) of unconsolidated affiliates 645 605 1,108 548  
Segment Assets 958,924 921,172 958,924 921,172  
Capital Expenditures 1,595 1,504 2,681 2,547  
Other | Natural Gas, NGLs and Oil Revenue          
Segment Reporting [Line Items]          
Revenues 240 231 622 492  
Other | Purchased Gas Revenue          
Segment Reporting [Line Items]          
Revenues 12,456 10,408 25,143 21,959  
Other | Transportation, Gathering and Compression          
Segment Reporting [Line Items]          
Transportation, Gathering and Compression 1,341 577 972 903  
Other | Enviromental Attributes          
Segment Reporting [Line Items]          
Other Revenue and Operating Income $ 14,436 $ 20,400 $ 29,376 $ 43,285