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Derivatives - Offsetting Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross Amounts of Recognized Assets $ 117,541us-gaap_DerivativeFairValueOfDerivativeAsset $ 998us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Consolidated Balance Sheet 0us-gaap_DerivativeAssetFairValueGrossLiability (567)us-gaap_DerivativeAssetFairValueGrossLiability
Net Amounts of Assets Presented in the Consolidated Balance Sheet $ 117,541us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral $ 431us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral