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Segment Information - Industry Segment Results (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments $ 1,928,652 $ (2,663,775) $ (1,632,733)
Other Revenue and Operating Income 129,860 87,322 105,883
Total Revenue and Other Operating Income 3,434,948 1,261,211 756,792
Total Operating Expense 1,192,109 1,321,641 1,234,874
Earnings Before Income Tax 2,222,925 (211,947) (636,513)
Segment Assets 8,626,657 8,515,773 8,100,751
Depreciation, Depletion and Amortization 433,586 461,215 515,118
Capital Expenditures 679,404 565,754 465,861
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 1,302,218 3,652,112 2,183,929
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 74,218 185,552 99,713
Citadel Energy Marketing LLC      
Segment Reporting Information [Line Items]      
Revenue 180,039   334,407
Total Revenue and Other Operating Income $ 180,039   $ 334,407
Citadel Energy Marketing LLC | Revenue from Contract with Customer Benchmark | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Percentage of revenue (more than) 10.00%   10.00%
Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Revenue $ 165,465 453,501 $ 235,760
Total Revenue and Other Operating Income $ 165,465 $ 453,501 $ 235,760
Direct Energy Business Marketing LLC | Revenue from Contract with Customer Benchmark | Customer Concentration Risk      
Segment Reporting Information [Line Items]      
Percentage of revenue (more than) 10.00% 10.00% 10.00%
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue $ 1,442,995 $ 3,907,282 $ 2,364,909
Investments in unconsolidated equity affiliates 13,682 11,714 17,301
Reportable Subsegments | Exploration and Production | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Expense     312,970
Segment Assets     981,405
Depreciation, Depletion and Amortization     16,492
Capital Expenditures     1,378
Reportable Subsegments | Exploration and Production | Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments 151,408 (1,672,974) (492,526)
Other Revenue and Operating Income 66,559 69,618 81,267
Total Revenue and Other Operating Income 1,388,360 1,731,321 1,577,734
Total Operating Expense 746,050 790,960 804,004
Earnings Before Income Tax 642,310 940,361 773,730
Segment Assets 6,656,655 6,452,075 6,071,495
Depreciation, Depletion and Amortization 365,020 388,641 440,024
Capital Expenditures 629,631 544,914 453,603
Reportable Subsegments | Exploration and Production | Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments 11,554 (139,131) (46,304)
Other Revenue and Operating Income 0 0 0
Total Revenue and Other Operating Income 142,317 175,564 147,274
Total Operating Expense 141,708 131,426 117,900
Earnings Before Income Tax 609 44,138 29,374
Segment Assets 948,795 959,126 1,047,851
Depreciation, Depletion and Amortization 50,052 53,201 58,602
Capital Expenditures 36,804 15,043 10,880
Reportable Subsegments | Exploration and Production | Operating Segments | Other      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments 1,765,690 (851,670) (1,093,903)
Other Revenue and Operating Income 63,301 17,704 24,616
Total Revenue and Other Operating Income 1,904,271 (645,674) (968,216)
Total Operating Expense 304,351 399,255  
Earnings Before Income Tax 1,580,006 (1,196,446) (1,439,617)
Segment Assets 1,021,207 1,104,572  
Depreciation, Depletion and Amortization 18,514 19,373  
Capital Expenditures 12,969 5,797  
Reportable Subsegments | Exploration and Production | Operating Segments | Shale and Other      
Segment Reporting Information [Line Items]      
Equity in earnings (loss) of affiliates 2,942 1,412 5,780
Reportable Subsegments | Exploration and Production | Operating Segments | Environmental Attributes      
Segment Reporting Information [Line Items]      
Other Revenue and Operating Income 40,685    
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Shale      
Segment Reporting Information [Line Items]      
Revenue 1,170,393 3,334,677 1,988,993
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Coalbed Methane      
Segment Reporting Information [Line Items]      
Revenue 130,763 314,695 193,578
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Other      
Segment Reporting Information [Line Items]      
Revenue 1,062 2,740 1,358
Reportable Subsegments | Exploration and Production | Operating Segments | Purchased Gas Revenue | Shale      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Reportable Subsegments | Exploration and Production | Operating Segments | Purchased Gas Revenue | Coalbed Methane      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Reportable Subsegments | Exploration and Production | Operating Segments | Purchased Gas Revenue | Other      
Segment Reporting Information [Line Items]      
Revenue $ 74,218 $ 185,552 $ 99,713