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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
COMPREHENSIVE INCOME:      
Net income $ 305,928us-gaap_NetIncomeLoss $ 252,195us-gaap_NetIncomeLoss $ 209,942us-gaap_NetIncomeLoss
Foreign currency translation adjustments, net of tax (23,341)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (5,708)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 2,892us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total comprehensive income $ 282,587us-gaap_ComprehensiveIncomeNetOfTax $ 246,487us-gaap_ComprehensiveIncomeNetOfTax $ 212,834us-gaap_ComprehensiveIncomeNetOfTax