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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 59,087us-gaap_NetIncomeLoss	$ 55,683us-gaap_NetIncomeLoss	$ 51,324us-gaap_NetIncomeLoss	$ 42,618us-gaap_NetIncomeLoss	$ 47,063us-gaap_NetIncomeLoss	$ 39,995us-gaap_NetIncomeLoss	$ 42,927us-gaap_NetIncomeLoss	$ 39,842us-gaap_NetIncomeLoss	$ 208,712us-gaap_NetIncomeLoss	$ 169,827us-gaap_NetIncomeLoss	$ 119,209us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments									(30,034)	(6,340)	4,613
Total comprehensive income									$ 178,678us-gaap_ComprehensiveIncomeNetOfTax	$ 163,487us-gaap_ComprehensiveIncomeNetOfTax	$ 123,822us-gaap_ComprehensiveIncomeNetOfTax

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

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- Definition

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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