Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement- Fair Value of Liabilities Measured on a Recurring Basis (Details)

v2.4.1.9
Fair Value Measurement- Fair Value of Liabilities Measured on a Recurring Basis (Details) (Other liabilities, Derivatives Designated as Hedging Instruments, Recurring, Level 2, Interest rate swap instruments, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Other liabilities | Derivatives Designated as Hedging Instruments | Recurring | Level 2 | Interest rate swap instruments
   
Liabilities:    
Interest rate swap instruments $ 5,232us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
$ 4,430us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember