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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Total Current Assets $ 107,625 $ 84,657
Total Other Non-Current Assets 204,459 188,237
Total Current Liabilities 415,774 42,329
Total Non-Current Liabilities 285,865 127,290
Commodity Swap    
Derivative [Line Items]    
Total Current Assets 576 53,668
Total Other Non-Current Assets 30,055 134,661
Total Current Liabilities 393,982 23,506
Total Non-Current Liabilities 258,360 59,388
Basis Swap    
Derivative [Line Items]    
Total Current Assets 106,921 30,848
Total Other Non-Current Assets 173,957 52,903
Total Current Liabilities 18,103 14,491
Total Non-Current Liabilities 21,007 57,150
Interest Rate Swap    
Derivative [Line Items]    
Total Current Assets 128 141
Total Other Non-Current Assets 447 673
Total Current Liabilities 3,689 4,332
Total Non-Current Liabilities $ 6,498 $ 10,752