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Segment Information - Industry Segment Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments $ (538,859) $ (63,303) $ (505,445) $ 51,839  
Other Revenue and Operating Income 25,494 15,944 50,445 39,308  
Total Revenue and Other Operating (Loss) Income (127,210) 148,841 345,864 565,200  
Total Operating Expense 280,711 262,512 580,516 1,105,811  
Loss Before Income Tax (446,176) (159,132) (310,771) (616,937)  
Assets 8,072,110 8,319,684 8,072,110 8,319,684 $ 8,041,764
Depreciation, Depletion and Amortization 122,607 113,545 251,551 242,709  
Capital Expenditures 128,958 134,852 252,387 286,901  
Investments in unconsolidated equity affiliates 16,726 15,159 16,726 15,159  
Natural Gas | Commodity Swap          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments (646,180) (28,970) (737,089) 129,155  
Natural Gas, NGL and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 369,449 175,776 750,674 427,270  
Natural Gas, NGL and Oil Revenue | Citadel Energy Marketing, LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating (Loss) Income 60,162   100,465    
Natural Gas, NGL and Oil Revenue | Direct Energy Business Marketing LLC          
Segment Reporting Information [Line Items]          
Total Revenue and Other Operating (Loss) Income   33,711 80,189 79,367  
Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 16,706 20,424 50,190 46,783  
Operating Segments          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 404,834 208,391 838,609 504,650  
Operating Segments | Shale          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments (9,394) 100,262 (7,212) 186,714  
Other Revenue and Operating Income 18,679 12,191 37,745 30,597  
Total Revenue and Other Operating (Loss) Income 341,944 265,080 705,361 590,432  
Total Operating Expense 191,996 154,306 380,707 346,254  
Loss Before Income Tax 149,948 110,774 324,654 244,178  
Assets 6,095,486 6,096,101 6,095,486 6,096,101  
Depreciation, Depletion and Amortization 104,380 93,984 213,886 201,030  
Capital Expenditures 127,230 131,974 248,348 279,814  
Operating Segments | Shale | Natural Gas, NGL and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 332,659 152,627 674,828 373,121  
Operating Segments | Shale | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 0 0 0 0  
Operating Segments | Coalbed Methane          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments (962) 13,005 (740) 22,692  
Other Revenue and Operating Income 0 0 0 0  
Total Revenue and Other Operating (Loss) Income 35,543 35,934 74,669 76,344  
Total Operating Expense 28,204 29,324 56,759 63,484  
Loss Before Income Tax 7,339 6,610 17,910 12,860  
Assets 1,069,470 1,132,217 1,069,470 1,132,217  
Depreciation, Depletion and Amortization 14,264 15,701 29,747 34,139  
Capital Expenditures 1,502 2,034 3,644 4,486  
Operating Segments | Coalbed Methane | Natural Gas, NGL and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 36,505 22,929 75,409 53,652  
Operating Segments | Coalbed Methane | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 0 0 0 0  
Other          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments (528,503) (176,570) (497,493) (157,567)  
Other Revenue and Operating Income 6,815 3,753 12,700 8,711  
Total Revenue and Other Operating (Loss) Income (504,697) (152,173) (434,166) (101,576)  
Total Operating Expense 60,511 78,882 143,050 696,073  
Loss Before Income Tax (603,463) (276,516) (653,335) (873,975)  
Assets 907,154 1,091,366 907,154 1,091,366  
Depreciation, Depletion and Amortization 3,963 3,860 7,918 7,540  
Capital Expenditures 226 844 395 2,601  
Equity in earnings (loss) of unconsolidated affiliates 1,553 1,259 2,504 1,421  
Other | Natural Gas | Commodity Swap          
Segment Reporting Information [Line Items]          
Gain (Loss) on Commodity Derivative Instruments   29,015   83,997  
Other | Natural Gas, NGL and Oil Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: 285 220 437 497  
Other | Purchased Gas Revenue          
Segment Reporting Information [Line Items]          
Revenue from Contracts with Customers: $ 16,706 $ 20,424 $ 50,190 $ 46,783