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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair value disclosure    
Debt obligations $ 127,730us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities $ 112,845us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Carrying value    
Fair value disclosure    
Debt obligations 126,759us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
105,832us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair value disclosure    
Fair value disclosure    
Debt obligations 126,743us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
105,842us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Term Loan    
Fair value disclosure    
Debt obligations 70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
83,750us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Term Loan | Carrying value    
Fair value disclosure    
Debt obligations 70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
83,750us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Term Loan | Fair value disclosure    
Fair value disclosure    
Debt obligations 70,000us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
83,750us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Notes payable    
Fair value disclosure    
Debt obligations 56,759us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
22,082us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Notes payable | Carrying value    
Fair value disclosure    
Debt obligations 56,759us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
22,082us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Notes payable | Fair value disclosure    
Fair value disclosure    
Debt obligations $ 56,743us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
$ 22,092us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember