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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 91,769	$ 81,005	$ 180,506	$ 158,502
Other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	7,222	(5,080)	9,710	(2,651)
Unrealized gain (loss) on investments:
Unrealized gains during the period, net of income taxes of $(51), $(49), $(32) and $(240)	165	20	141	350
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(53), $12, $(43) and $(91)	111	(23)	89	164
Unrealized gain (loss) on investments:	276	(3)	230	514
Total other comprehensive gain (loss), net of tax	7,498	(5,083)	9,940	(2,137)
Comprehensive income	$ 99,267	$ 75,922	$ 190,446	$ 156,365

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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. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and 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 after tax and 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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