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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 $ 63,558us-gaap_NetIncomeLoss $ 59,274us-gaap_NetIncomeLoss $ 70,569us-gaap_NetIncomeLoss
Other comprehensive income (loss):      
Foreign currency translation adjustments (5,855)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (5,376)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (2,394)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Total other comprehensive income (loss) (5,855)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (5,376)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (2,394)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 57,703us-gaap_ComprehensiveIncomeNetOfTax $ 53,898us-gaap_ComprehensiveIncomeNetOfTax $ 68,175us-gaap_ComprehensiveIncomeNetOfTax