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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 77,497	$ 84,611
Other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments	2,429	(8,783)
Unrealized gain (loss) on investments:
Unrealized gains during the period, net of income taxes of $(191) and $(25)	330	7
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(103) and $52	187	(94)
Unrealized gain (loss) on investments:	517	(87)
Total other comprehensive gain (loss), net of tax	2,946	(8,870)
Comprehensive income	$ 80,443	$ 75,741

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