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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Effect of derivative instruments on the Consolidated Balance Sheet |  |
Derivative instruments (current) | $ 18,501 | $ 0
Other liabilities (non-current) | 994 | 0
Net amounts of liabilities presented in the statement of financial position | 19,495 | 0
Derivatives Not Designated as Hedges | Commodity contracts |  |
Effect of derivative instruments on the Consolidated Balance Sheet |  |
Derivative instruments (current) | 18,501 | 0
Other liabilities (non-current) | $ 994 | $ 0

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