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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
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

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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