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Interest Rate Derivatives and Hedging Activities (Narrative) (Details) (Designated as Hedging Instrument, Cash Flow Hedging, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Derivatives at Fair Value | Interest rate swaps
 
Derivative [Line Items]  
Fair value of derivatives $ 2.3us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_DerivativeByNatureAxis
= us-gaap_SwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swaps, net
 
Derivative [Line Items]  
Amount required to settle its obligations under the agreement at its aggregate termination value incase of breach 2.3us-gaap_AssetsNeededForImmediateSettlementAggregateFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swaps, net | Interest Expense
 
Derivative [Line Items]  
Interests reclassified to AOCI 12 months
Interests reclassified to AOCI period $ 1.8us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember