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Fair Value Measurements and Derivative Instruments (Offsetting of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting of Financial Assets under Master Netting Agreements [Abstract]
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet	$ 63,981	$ 188,576
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	(63,981)	(91,627)
Net Amount of Derivative Assets	0us-gaap_DerivativeAssets	96,949us-gaap_DerivativeAssets
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet	(767,635)	(100,260)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	63,981	91,627
Net Amount of Derivative Liabilities	$ (703,654)us-gaap_DerivativeLiabilities	$ (8,633)us-gaap_DerivativeLiabilities

Fair value, after the effects of master netting arrangements, of a financial asset or other 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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