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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 $ 454,029us-gaap_NetIncomeLoss $ 377,292us-gaap_NetIncomeLoss $ 312,310us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustments, net of tax benefit (expense) of $65, $1,841, and ($182) (44,371)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 4,913us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 4,124us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized gain (loss) on derivative instruments, net of tax benefit (expense) of $970, ($950), and $2,325 (1,631)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 1,610us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (3,909)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Comprehensive income $ 408,027us-gaap_ComprehensiveIncomeNetOfTax $ 383,815us-gaap_ComprehensiveIncomeNetOfTax $ 312,525us-gaap_ComprehensiveIncomeNetOfTax