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Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value (Details) (Fair Value Measurements Recurring [Member], Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Fair Value Inputs Level2 [Member]
  
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)  
Derivative financial instruments $ (33)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Fair Value Inputs Level1 [Member]
  
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)  
Derivative financial instruments 0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Estimate of Fair Value Measurement [Member]  
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)  
Derivative financial instruments $ (33)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember