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Derivative Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Derivative [Line Items]  
Derivative, Notional Amount $ 487,531invest_DerivativeNotionalAmount
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]  
Derivative [Line Items]  
Derivative, Notional Amount 257,506invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]  
Derivative [Line Items]  
Derivative, Notional Amount $ 230,025invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember