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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 501,426	$ 505,868	$ 404,389
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	7,618	(12,065)	17,597
Unrealized holding gain (loss) on investments:
Unrealized holding gains (losses) during the period, net of income taxes of $(461), $285 and $1	1,486	(1,088)	190
Less: reclassification adjustment for losses realized in net income, net of income taxes of $(101), $(96) and $(99)	392	61	260
Total other comprehensive income (loss), net of taxes	9,496	(13,092)	18,047
Comprehensive income	$ 510,922	$ 492,776	$ 422,436

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