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Derivative Instruments and Hedging Activities (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivative Assets    
Gross amounts of recognized assets $ 134,041us-gaap_DerivativeFairValueOfDerivativeAsset $ 137,603us-gaap_DerivativeFairValueOfDerivativeAsset
Gross amounts offset in the statement of financial position 0us-gaap_DerivativeAssetFairValueGrossLiability 0us-gaap_DerivativeAssetFairValueGrossLiability
Net amounts of assets presented in the statement of financial position 134,041us-gaap_DerivativeAssets 137,603us-gaap_DerivativeAssets
Gross amounts of financial instruments not offset in the statement of financial position 0us-gaap_DerivativeCollateralObligationToReturnCash 2,338us-gaap_DerivativeCollateralObligationToReturnCash
Net amount $ 134,041us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral $ 139,941us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral