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DEBT (Details 2) (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
Not recorded at fair value    
Debt    
Fixed-rate debt 360,434us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember		 362,602us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Fair Value | Level 2 - Market approach    
Debt    
Fixed-rate debt 344,058us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 349,517us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carried at fair value    
Debt    
Variable-rate debt $ 102,300us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtFairValueFairValueDisclosureMember		 $ 102,600us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtFairValueFairValueDisclosureMember