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Derivatives and Hedging Activity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
instruments
Designated as Hedging Instrument | Interest rate swaps  
Derivative [Line Items]  
Number of Instruments 14us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Derivative, Notional Amount $ 365,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Designated as Hedging Instrument | Interest rate caps  
Derivative [Line Items]  
Number of Instruments 3us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Derivative, Notional Amount 243,079invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Not Designated as Hedging Instrument | Interest rate caps  
Derivative [Line Items]  
Number of Instruments 1us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Derivative, Notional Amount $ 96,409invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateCapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember