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DEBT (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt    
Fixed-rate debt $ 462,691us-gaap_LongtermDebtPercentageBearingFixedInterestAmount $ 465,220us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Variable-rate debt 166,082us-gaap_LongtermDebtPercentageBearingVariableInterestAmount 161,313us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Total $ 628,773us-gaap_LongTermDebt $ 626,533us-gaap_LongTermDebt
Cash flow hedges | Interest rate derivatives    
Debt    
Weighted average interest rate, after giving effect to interest rate derivatives (as a percent) 4.33%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 4.35%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember