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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Commodity Swaps |  |
Asset Derivative Instruments |  |
Prepaid Expense | $ 144,771 | $ 28,612
Other Assets | 176,794 | 164,310
Total Asset | 321,565 | 192,922
Liability Derivative Instruments |  |
Other Accrued Liabilities | 1,606 | 34,640
Other Liabilities | 37,603 | 52,011
Total Liability | 39,209 | 86,651
Basis Swap |  |
Asset Derivative Instruments |  |
Prepaid Expense | 4,934 | 11,628
Other Assets | 13,225 | 48,788
Total Asset | 18,159 | 60,416
Liability Derivative Instruments |  |
Other Accrued Liabilities | 46,250 | 27,021
Other Liabilities | 97,893 | 40,210
Total Liability | $ 144,143 | $ 67,231

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