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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Commodity Swaps |  |
Asset Derivative Instruments |  |
Prepaid Expense | $ 172,836 | $ 28,612
Other Assets | 254,967 | 164,310
Total Asset | 427,803 | 192,922
Liability Derivative Instruments |  |
Other Accrued Liabilities | 1,389 | 34,640
Other Liabilities | 17,440 | 52,011
Total Liability | 18,829 | 86,651
Basis Swap |  |
Asset Derivative Instruments |  |
Prepaid Expense | 25,420 | 11,628
Other Assets | 20,925 | 48,788
Total Asset | 46,345 | 60,416
Liability Derivative Instruments |  |
Other Accrued Liabilities | 43,437 | 27,021
Other Liabilities | 98,638 | 40,210
Total Liability | $ 142,075 | $ 67,231

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