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SEGMENT INFORMATION - Industry Segment Results (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments $ (172,405) $ 1,928,652 $ (2,663,775)
Other Revenue and Operating Income 193,647 129,860 87,322
Total Revenue and Other Operating Income 1,266,786 3,434,948 1,261,211
Lease Operating Expense 70,646 63,333 66,658
Production, Ad Valorem and Other Fees 27,554 27,946 44,965
Depreciation, Depletion and Amortization 485,754 433,586 461,215
Interest Expense 150,594 143,278 127,689
Other Segment Items 270,380 161,946 402,971
Total Costs and Expenses 1,387,148 1,212,023 1,473,158
Income (Loss) Before Income Tax (120,362) 2,222,925 (211,947)
Equity in earnings (loss) of affiliates 1,314 2,942 1,412
Segment Assets 8,511,903 8,626,657 8,515,773
Capital Expenditures 540,332 679,404 565,754
Investments in unconsolidated equity affiliates 18,380 13,682 11,714
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 1,186,077 1,302,218 3,652,112
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 59,467 74,218 185,552
Environmental Attributes      
Segment Reporting Information [Line Items]      
Other Revenue and Operating Income 95,490 40,685  
Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 382,220 381,934 369,660
Citadel Energy Marketing LLC      
Segment Reporting Information [Line Items]      
Revenue 134,909 180,039  
Total Revenue and Other Operating Income 134,909 180,039  
NRG Business      
Segment Reporting Information [Line Items]      
Revenue 132,935 165,465 453,501
Total Revenue and Other Operating Income 132,935 165,465 453,501
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 1,313,852 1,442,995 3,907,282
Other      
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments (453,475) 1,765,690 (851,670)
Other Revenue and Operating Income 125,339 63,301 17,704
Total Revenue and Other Operating Income (267,755) 1,904,271 (645,674)
Lease Operating Expense 570 (349) (306)
Production, Ad Valorem and Other Fees 59 66 (134)
Depreciation, Depletion and Amortization 20,872 18,514 19,373
Interest Expense 150,594 143,278 127,689
Other Segment Items 270,380 161,946 402,971
Total Costs and Expenses 443,908 324,266 550,772
Income (Loss) Before Income Tax (711,663) 1,580,005 (1,196,446)
Segment Assets 922,085 1,021,207 1,104,572
Capital Expenditures 15,465 12,969 5,797
Other | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 914 1,062 2,740
Other | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 59,467 74,218 185,552
Other | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 1,433 811 1,179
Shale | Operating Segments      
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments 260,395 151,408 (1,672,974)
Other Revenue and Operating Income 68,308 66,559 69,618
Total Revenue and Other Operating Income 1,408,747 1,388,360 1,731,321
Lease Operating Expense 48,079 43,740 49,589
Production, Ad Valorem and Other Fees 22,036 21,636 33,307
Depreciation, Depletion and Amortization 405,292 365,020 388,641
Interest Expense 0 0 0
Other Segment Items 0 0 0
Total Costs and Expenses 791,574 746,049 790,960
Income (Loss) Before Income Tax 617,173 642,311 940,361
Segment Assets 6,669,076 6,656,655 6,452,075
Capital Expenditures 495,538 629,631 544,914
Shale | Operating Segments | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 1,080,044 1,170,393 3,334,677
Shale | Operating Segments | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Shale | Operating Segments | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression 316,167 315,653 319,423
Coalbed Methane | Operating Segments      
Segment Reporting Information [Line Items]      
(Loss) Gain on Commodity Derivative Instruments 20,675 11,554 (139,131)
Other Revenue and Operating Income 0 0 0
Total Revenue and Other Operating Income 125,794 142,317 175,564
Lease Operating Expense 21,997 19,942 17,375
Production, Ad Valorem and Other Fees 5,459 6,244 11,792
Depreciation, Depletion and Amortization 59,590 50,052 53,201
Interest Expense 0 0 0
Other Segment Items 0 0 0
Total Costs and Expenses 151,666 141,708 131,426
Income (Loss) Before Income Tax (25,872) 609 44,138
Segment Assets 920,742 948,795 959,126
Capital Expenditures 29,329 36,804 15,043
Coalbed Methane | Operating Segments | Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 105,119 130,763 314,695
Coalbed Methane | Operating Segments | Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Coalbed Methane | Operating Segments | Transportation, Gathering and Compression      
Segment Reporting Information [Line Items]      
Transportation, Gathering and Compression $ 64,620 $ 65,470 $ 49,058