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Derivative Instruments Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Asset Derivative Instruments    
Current Assets $ 247,794 $ 40,240
Other Assets 314,096 213,098
Liability Derivative Instruments    
Current Liabilities 115,138 92,221
Non-Current Liabilities 40,971 61,661
Commodity Swaps    
Asset Derivative Instruments    
Current Assets 234,238 28,612
Other Assets 288,543 164,310
Total Asset 522,781 192,922
Liability Derivative Instruments    
Current Liabilities 345 34,640
Non-Current Liabilities 9,693 52,011
Total Liability 10,038 86,651
Basis Only Swaps    
Asset Derivative Instruments    
Current Assets 13,556 11,628
Other Assets 25,553 48,788
Total Asset 39,109 60,416
Liability Derivative Instruments    
Current Liabilities 40,626 27,021
Non-Current Liabilities 105,445 40,210
Total Liability $ 146,071 $ 67,231