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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
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 189,176us-gaap_NetIncomeLoss	$ 364,888us-gaap_NetIncomeLoss	$ 221,645us-gaap_NetIncomeLoss
Other comprehensive income, net of tax:
Foreign currency translation adjustment, net of taxes of $(3,949), $(650) and $420, respectively	(5,113)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	6,251us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	7,843us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Net unrealized gains/(losses) on foreign currency cash flow hedges, net of taxes of $(1,870), $(1,470) and $(869), respectively	1,578us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	2,650us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3,299us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Less: Reclassification adjustment for realized losses/(gains) in current earnings, net of taxes of $222, $1,842 and $968, respectively	(1,758)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(3,307)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	(399)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Total	(5,293)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5,594us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10,743us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 183,883us-gaap_ComprehensiveIncomeNetOfTax	$ 370,482us-gaap_ComprehensiveIncomeNetOfTax	$ 232,388us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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