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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 447,286	$ 501,426	$ 505,868
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	5,620	7,618	(12,065)
Unrealized holding gain (loss) on investments:
Unrealized holding gains (losses) during the period, net of income taxes of $(134), $(461) and $285	374	1,486	(1,088)
Less: reclassification adjustment for losses realized in net income, net of income taxes of $(190), $(101) and $(96)	712	392	61
Total other comprehensive income (loss), net of taxes	6,706	9,496	(13,092)
Comprehensive income	$ 453,992	$ 510,922	$ 492,776

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