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SEGMENT INFORMATION - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments $ (528,220) $ 7,528  
Other Revenue and Operating Income 47,964 36,776  
Total Revenue and Other Operating Income 82,388 384,553  
Lease Operating Expense 23,333 17,726  
Production, Ad Valorem and Other Fees 7,273 7,624  
Depreciation, Depletion and Amortization 127,062 118,650  
Interest Expense 41,612 37,441  
Other Segment Items 60,748 100,142  
Total Costs and Expenses 355,187 378,234  
Income (Loss) Before Income Tax (272,799) 6,319  
Segment Assets 9,046,709 8,656,642 $ 8,511,903
Capital Expenditures 131,465 168,184  
Investments in unconsolidated equity affiliates 18,323 13,631  
NRG Business Marketing LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income   42,909  
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 551,094 325,972  
Natural Gas, NGLs and Oil Revenue | Citadel Energy Marketing, LLC      
Segment Reporting Information [Line Items]      
Total Revenue and Other Operating Income 64,800    
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenues 11,550 14,277  
Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 95,159 96,651  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 579,482 356,143  
Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments (102,700) 50,779  
Other Revenue and Operating Income 16,838 15,894  
Total Revenue and Other Operating Income 421,693 359,435  
Lease Operating Expense 17,219 12,170  
Production, Ad Valorem and Other Fees 5,500 5,934  
Depreciation, Depletion and Amortization 106,360 99,476  
Interest Expense 0 0  
Other Segment Items 0 0  
Total Costs and Expenses 207,129 198,106  
Income (Loss) Before Income Tax 214,564 161,329  
Segment Assets 7,089,357 6,667,562  
Capital Expenditures 127,679 152,874  
Operating Segments | Shale | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 507,555 292,762  
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 78,050 80,526  
Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments (6,953) 3,846  
Other Revenue and Operating Income 0 0  
Total Revenue and Other Operating Income 36,325 36,709  
Lease Operating Expense 5,969 5,374  
Production, Ad Valorem and Other Fees 1,766 1,674  
Depreciation, Depletion and Amortization 13,812 14,273  
Interest Expense 0 0  
Other Segment Items 0 0  
Total Costs and Expenses 38,330 37,004  
Income (Loss) Before Income Tax (2,005) (295)  
Segment Assets 912,921 939,781  
Capital Expenditures 2,743 8,668  
Operating Segments | Coalbed Methane | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 43,278 32,863  
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 16,783 15,683  
Other      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments (418,567) (47,097)  
Other Revenue and Operating Income 31,126 20,882  
Total Revenue and Other Operating Income (375,630) (11,591)  
Lease Operating Expense 145 182  
Production, Ad Valorem and Other Fees 7 16  
Depreciation, Depletion and Amortization 6,890 4,901  
Interest Expense 41,612 37,441  
Other Segment Items 60,748 100,142  
Total Costs and Expenses 109,728 143,124  
Income (Loss) Before Income Tax (485,358) (154,715)  
Equity in earnings (loss) of unconsolidated affiliates 58 250  
Segment Assets 1,044,431 1,049,299  
Capital Expenditures 1,043 6,642  
Other | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenues 261 347  
Other | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenues 11,550 14,277  
Other | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 326 442  
Other | Enviromental Attributes      
Segment Reporting Information [Line Items]      
Other Revenue and Operating Income $ 22,886 $ 12,769