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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
U.S. Federal $ 13,767us-gaap_CurrentFederalTaxExpenseBenefit $ 14,769us-gaap_CurrentFederalTaxExpenseBenefit $ 13,989us-gaap_CurrentFederalTaxExpenseBenefit
State 2,492us-gaap_CurrentStateAndLocalTaxExpenseBenefit 2,241us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,905us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 4,521us-gaap_CurrentForeignTaxExpenseBenefit 3,623us-gaap_CurrentForeignTaxExpenseBenefit 873us-gaap_CurrentForeignTaxExpenseBenefit
Total current 20,780us-gaap_CurrentIncomeTaxExpenseBenefit 20,633us-gaap_CurrentIncomeTaxExpenseBenefit 16,767us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
U.S. Federal 2,721us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,068)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (270)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (155)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (218)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 79us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign (532)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (351)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (517)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred 2,034us-gaap_DeferredIncomeTaxExpenseBenefit (2,637)us-gaap_DeferredIncomeTaxExpenseBenefit (708)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense $ 22,814us-gaap_IncomeTaxExpenseBenefit $ 17,996us-gaap_IncomeTaxExpenseBenefit $ 16,059us-gaap_IncomeTaxExpenseBenefit
Reconciliation between the effective income tax rate and the applicable statutory federal and state income tax rate      
Taxes computed at statutory rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Non-deductible transaction costs 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense    
State income taxes (net of federal income tax benefit) (as a percent) 2.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign rate differential (as a percent) (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Other (as a percent) 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total (as a percent) 37.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations