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Derivative Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Interest Rate Swap    
Derivatives, Fair Value    
Collateral posted $ 2.4us-gaap_DerivativeLiabilityFairValueOfCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Interest Rate Swap | Other Liabilities    
Derivatives, Fair Value    
Fair value of derivative assets 1.4us-gaap_InterestRateCashFlowHedgeAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
2.5us-gaap_InterestRateCashFlowHedgeAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Foreign Currency Forward Contract | Other Assets    
Derivatives, Fair Value    
Amount of derivative gain (loss) reported $ 0.5us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember