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Segment Information - Industry Segment Results (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments $ (2,663,775) $ (1,632,733) $ 172,982
Other Revenue and Operating Income 87,322 105,883 82,459
Total Revenue and Other Operating Income 1,261,211 756,792 1,257,978
Total Operating Expense 1,321,641 1,234,874 1,697,744
Earnings (Loss) Before Income Tax (211,947) (636,513) (602,831)
Segment Assets 8,515,773 8,100,751 8,041,764
Depreciation, Depletion and Amortization 461,215 515,118 501,821
Capital Expenditures 565,754 465,861 487,291
Natural Gas, NGLs and Oil Revenue      
Segment Reporting Information [Line Items]      
Revenue 3,652,112 2,183,929 896,745
Purchased Gas Revenue      
Segment Reporting Information [Line Items]      
Revenue 185,552 99,713 105,792
Citadel Energy Marketing LLC      
Segment Reporting Information [Line Items]      
Revenue   334,407  
Total Revenue and Other Operating Income   334,407  
Direct Energy Business Marketing LLC      
Segment Reporting Information [Line Items]      
Revenue 453,501 235,760 167,390
Total Revenue and Other Operating Income 453,501 235,760 167,390
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 3,907,282 2,364,909 1,067,247
Investments in Unconsolidated Equity Affiliates 11,714 17,301 16,022
Corporate, Non-Segment | Natural Gas | Commodity Swap      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments     83,997
Reportable Subsegments | Exploration and Production | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Expense     860,863
Segment Assets     877,015
Depreciation, Depletion and Amortization     15,635
Capital Expenditures     2,957
Reportable Subsegments | Exploration and Production | Operating Segments | Shale      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments (1,672,974) (492,526) 337,269
Other Revenue and Operating Income 69,618 81,267 64,710
Total Revenue and Other Operating Income 1,731,321 1,577,734 1,183,017
Total Operating Expense 790,960 804,004 709,036
Earnings (Loss) Before Income Tax 940,361 773,730 473,981
Segment Assets 6,452,075 6,071,495 6,068,933
Depreciation, Depletion and Amortization 388,641 440,024 416,441
Capital Expenditures 544,914 453,603 474,545
Reportable Subsegments | Exploration and Production | Operating Segments | Coalbed Methane      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments (139,131) (46,304) 39,884
Other Revenue and Operating Income 0 0 0
Total Revenue and Other Operating Income 175,564 147,274 154,250
Total Operating Expense 131,426 117,900 127,845
Earnings (Loss) Before Income Tax 44,138 29,374 26,405
Segment Assets 959,126 1,047,851 1,095,816
Depreciation, Depletion and Amortization 53,201 58,602 69,745
Capital Expenditures 15,043 10,880 9,789
Reportable Subsegments | Exploration and Production | Operating Segments | Other      
Segment Reporting Information [Line Items]      
Loss on Commodity Derivative Instruments (851,670) (1,093,903) (204,171)
Other Revenue and Operating Income 17,704 24,616 17,749
Total Revenue and Other Operating Income (645,674) (968,216) (79,289)
Total Operating Expense 399,255 312,970  
Earnings (Loss) Before Income Tax (1,196,446) (1,439,617) (1,103,217)
Segment Assets 1,104,572 981,405  
Depreciation, Depletion and Amortization 19,373 16,492  
Capital Expenditures 5,797 1,378  
Reportable Subsegments | Exploration and Production | Operating Segments | Shale and Other      
Segment Reporting Information [Line Items]      
Equity in Earnings (Loss) of Affiliates 1,412 5,780 688
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Shale      
Segment Reporting Information [Line Items]      
Revenue 3,334,677 1,988,993 781,038
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Coalbed Methane      
Segment Reporting Information [Line Items]      
Revenue 314,695 193,578 114,366
Reportable Subsegments | Exploration and Production | Operating Segments | Natural Gas, NGLs and Oil Revenue | Other      
Segment Reporting Information [Line Items]      
Revenue 2,740 1,358 1,341
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 $ 185,552 $ 99,713 $ 105,792