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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 132,168	$ 128,319	$ 372,689	$ 389,834
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(5,207)	(435)	(4,687)	(7,261)
Unrealized gain (loss) on investments:
Unrealized gains (losses) during the period, net of income taxes of $(27), $91, $(497) and $463	71	(337)	1,633	(1,662)
Less: reclassification adjustment for losses (gains) realized in net income, net of income taxes of $(23), $(29), $(73) and $(75)	96	130	274	(32)
Unrealized gain (loss) on investments:	167	(207)	1,907	(1,694)
Total other comprehensive loss, net of tax	(5,040)	(642)	(2,780)	(8,955)
Comprehensive income	$ 127,128	$ 127,677	$ 369,909	$ 380,879

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