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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 45,709us-gaap_NetIncomeLoss $ 43,397us-gaap_NetIncomeLoss $ 44,777us-gaap_NetIncomeLoss
Other comprehensive loss:      
Foreign currency translation adjustment, net of tax benefits of $11 in 2014 and $6 in 2013 (71)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (31)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax  
Comprehensive income $ 45,638us-gaap_ComprehensiveIncomeNetOfTax $ 43,366us-gaap_ComprehensiveIncomeNetOfTax $ 44,777us-gaap_ComprehensiveIncomeNetOfTax