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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Total Current Assets $ 70,251 $ 84,657
Total Other Non-Current Assets 235,695 188,237
Total Current Liabilities 83,762 42,329
Total Non-Current Liabilities 83,705 127,290
Commodity Swap    
Derivative [Line Items]    
Total Current Assets 19,968 53,668
Total Other Non-Current Assets 109,122 134,661
Total Current Liabilities 64,215 23,506
Total Non-Current Liabilities 56,898 59,388
Basis Swap    
Derivative [Line Items]    
Total Current Assets 50,145 30,848
Total Other Non-Current Assets 126,035 52,903
Total Current Liabilities 15,897 14,491
Total Non-Current Liabilities 19,704 57,150
Interest Rate Swap    
Derivative [Line Items]    
Total Current Assets 138 141
Total Other Non-Current Assets 538 673
Total Current Liabilities 3,650 4,332
Total Non-Current Liabilities $ 7,103 $ 10,752