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SEGMENT INFORMATION - Schedule of Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments $ 3,981 $ (528,220)  
Other Revenue and Operating Income 47,942 47,964  
Total Revenue and Other Operating Income 786,654 82,388  
Lease Operating Expense 21,770 23,333  
Production, Ad Valorem and Other Fees 8,789 7,273  
Depreciation, Depletion and Amortization 134,613 127,062  
Interest Expense 40,470 41,612  
Other Segment Items 50,206 60,748  
Total Costs and Expenses 358,249 355,187  
Income (Loss) Before Income Tax 428,405 (272,799)  
Segment Assets 9,131,183 9,046,709 $ 9,094,446
Capital Expenditures 169,906 131,465  
Investments in unconsolidated equity affiliates 5,810 18,323  
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 722,044 551,094  
Natural Gas, NGLs and Oil Revenue | NRG Business Marketing LLC      
Segment Reporting Information [Line Items]      
Revenues 156,014    
Natural Gas, NGLs and Oil Revenue | DTE Energy Trading, Inc.      
Segment Reporting Information [Line Items]      
Revenues 83,346    
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC      
Segment Reporting Information [Line Items]      
Revenues   64,800  
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenues 12,687 11,550  
Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 102,401 95,159  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 751,100 579,482  
Operating Segments | Shale      
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments (208,340) (102,700)  
Other Revenue and Operating Income 16,369 16,838  
Total Revenue and Other Operating Income 470,929 421,693  
Lease Operating Expense 15,542 17,219  
Production, Ad Valorem and Other Fees 6,564 5,500  
Depreciation, Depletion and Amortization 112,964 106,360  
Interest Expense 0 0  
Other Segment Items 0 0  
Total Costs and Expenses 221,846 207,129  
Income (Loss) Before Income Tax 249,083 214,564  
Segment Assets 7,268,317 7,190,127  
Capital Expenditures 163,420 127,679  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 662,900 507,555  
Operating Segments | Shale | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Operating Segments | Shale | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 86,776 78,050  
Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments (13,197) (6,953)  
Other Revenue and Operating Income 0 0  
Total Revenue and Other Operating Income 45,564 36,325  
Lease Operating Expense 6,026 5,969  
Production, Ad Valorem and Other Fees 2,212 1,766  
Depreciation, Depletion and Amortization 14,416 13,812  
Interest Expense 0 0  
Other Segment Items 0 0  
Total Costs and Expenses 38,649 38,330  
Income (Loss) Before Income Tax 6,915 (2,005)  
Segment Assets 894,991 909,369  
Capital Expenditures 5,400 2,743  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 58,761 43,278  
Operating Segments | Coalbed Methane | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Operating Segments | Coalbed Methane | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 15,995 16,783  
Other      
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments 225,518 (418,567)  
Other Revenue and Operating Income 31,573 31,126  
Total Revenue and Other Operating Income 270,161 (375,630)  
Lease Operating Expense 202 145  
Production, Ad Valorem and Other Fees 13 7  
Depreciation, Depletion and Amortization 7,233 6,890  
Interest Expense 40,470 41,612  
Other Segment Items 50,206 60,748  
Total Costs and Expenses 97,754 109,728  
Income (Loss) Before Income Tax 172,407 (485,358)  
Equity in earnings (loss) of unconsolidated affiliates 463 58  
Segment Assets 967,875 947,213  
Capital Expenditures 1,086 1,043  
Other | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 383 261  
Other | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenues 12,687 11,550  
Other | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression (370) 326  
Other | Enviromental Attributes      
Segment Reporting Information [Line Items]      
Other Revenue and Operating Income $ 14,940 $ 22,886