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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

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