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Summary of Significant Accounting Policies - Schedule of Derivative Instruments, Gain (Loss) on the Income Statement (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Comprehensive Income [Roll Forward]    
Beginning balance of OCI related to interest rate contracts $ 2,661us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 1,162us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Unrealized loss recognized in OCI due to change in fair value of interest rate contracts 791us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 634us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Loss reclassified from OCI into income (as interest expense) (166)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax (82)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Net change in OCI 625us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 552us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Ending balance of accumulated OCI related to derivatives 3,286us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 1,714us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Allocation of OCI, non-controlling interests (237)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest (185)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Accumulated other comprehensive loss $ 3,049us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ 1,529us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent