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Condensed Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 6,846us-gaap_NetIncomeLoss $ 7,871us-gaap_NetIncomeLoss
Other comprehensive income:    
Foreign currency translation adjustment, net of tax provision of $16 in 2015 and $6 in 2014 72us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 28us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Comprehensive income $ 6,918us-gaap_ComprehensiveIncomeNetOfTax $ 7,899us-gaap_ComprehensiveIncomeNetOfTax