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Fair Value Measurments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative Assets [Abstract]
Derivative assets	$ 55,425	$ 104,190
Derivative Liabilities [Abstract]
Derivative liabilities	0	$ 0
Fair Value, Inputs, Level 2 [Member]
Derivative Assets [Abstract]
Derivative assets	$ 55,425

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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