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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Total Current Assets $ 83,870 $ 84,657
Total Other Non-Current Assets 179,176 188,237
Total Current Liabilities 1,168,597 42,329
Total Non-Current Liabilities 858,767 127,290
Commodity Swap    
Derivative [Line Items]    
Total Current Assets 0 53,668
Total Other Non-Current Assets 6,665 134,661
Total Current Liabilities 1,133,730 23,506
Total Non-Current Liabilities 834,009 59,388
Basis Swap    
Derivative [Line Items]    
Total Current Assets 83,841 30,848
Total Other Non-Current Assets 172,511 52,903
Total Current Liabilities 31,413 14,491
Total Non-Current Liabilities 19,987 57,150
Interest Rate Swap    
Derivative [Line Items]    
Total Current Assets 29 141
Total Other Non-Current Assets 0 673
Total Current Liabilities 3,454 4,332
Total Non-Current Liabilities $ 4,771 $ 10,752