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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 $ 88,563us-gaap_NetIncomeLoss $ 80,901us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax:    
Foreign currency translation adjustments, net of tax benefit (expense) of $15 in 2015 and ($16) in 2014 (30,156)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 1,307us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized gain on derivative instruments, net of tax expense of $935 in 2015 and $337 in 2014 1,572us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 566us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Comprehensive income $ 59,979us-gaap_ComprehensiveIncomeNetOfTax $ 82,774us-gaap_ComprehensiveIncomeNetOfTax