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Derivative Instruments - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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General Discussion of Derivative Instruments and Hedging Activities [Abstract] |  |
Short-term derivative instruments - assets | $ 3,488 | $ 142,794
Long-term derivative instruments | 5,696 | 51,088
Short-term derivative instruments - liability | 119,219 | 437
Long-term derivative instruments - liability | $ 26,759 | $ 6,935

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