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ACCRUED EXPENSES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ACCRUED EXPENSES [Abstract]    
Accrued compensation and benefits $ 5,787us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent $ 5,128us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent
Accrued rent and real estate taxes 3,251us-gaap_AccruedRentCurrentAndNoncurrent 2,245us-gaap_AccruedRentCurrentAndNoncurrent
Other accrued expenses 4,827us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent 3,282us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
Accrued expenses $ 13,865us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent $ 10,655us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent