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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative Assets
Derivative Assets, Current	$ 19,943	$ 27,850
Derivative Liabilities
Derivative Liabilities, Current		(1,249)
Fair Value, Net Asset	19,943	26,601
Level 2 [Member]
Derivative Liabilities
Fair Value, Net Asset	19,943	26,601
Current assets - Fair market value of derivatives [Member]
Derivative Assets
Derivative Assets, Current	19,943	27,850
Current assets - Fair market value of derivatives [Member] \| Level 2 [Member]
Derivative Assets
Derivative Assets, Current	$ 19,943	27,850
Current liabilities - Fair value of derivatives [Member]
Derivative Liabilities
Derivative Liabilities, Current		(1,249)
Current liabilities - Fair value of derivatives [Member] \| Level 2 [Member]
Derivative Liabilities
Derivative Liabilities, Current		$ (1,249)

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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