Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 15,004us-gaap_NetIncomeLoss	$ 18,723us-gaap_NetIncomeLoss
Other comprehensive income, before tax and net of reclassification adjustments:
Foreign currency translation adjustment	(14,951)	(1,139)
Unrealized (loss) gain on securities available-for-sale	506	192
Unrealized gain (loss) on derivative instruments	982	(1,873)
Other comprehensive loss, before tax	(13,463)	(2,820)
Tax expense related to items of other comprehensive income	(2,915)us-gaap_OtherComprehensiveIncomeLossTax	(774)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive loss, net of tax	(10,548)	(2,046)
Comprehensive income	$ 4,456us-gaap_ComprehensiveIncomeNetOfTax	$ 16,677us-gaap_ComprehensiveIncomeNetOfTax

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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