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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative instruments — current assets | $ 91,590 | $ 139,697
Derivative instruments — non-current assets | 7,521 | 15,776
Derivative instruments — current liabilities | (1,018) | 0
Derivative instruments — non-current liabilities | (1,558) | 0
Total derivative instruments | 96,535 |
Crude oil [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative instruments — current assets | 91,590 | 139,697
Derivative instruments — non-current assets | 7,521 | 15,776
Derivative instruments — current liabilities | (1,018) | 0
Derivative instruments — non-current liabilities | (1,558) | 0
Total derivative instruments | $ 96,535 | $ 155,473

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