Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 224,305	$ 168,375	$ 601,559	$ 451,599
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(747)	1,065	(1,097)	(481)
Changes in net unrealized gains (losses) on available-for-sale marketable securities	(118)	(390)	(1,145)	8,836
Less: reclassification adjustment for net (gains) included in net income	0	(9,432)	0	(9,432)
Net change	(118)	(9,822)	(1,145)	(596)
Other comprehensive income (loss)	(865)	(8,757)	(2,242)	(1,077)
Comprehensive income	$ 223,440	$ 159,618	$ 599,317	$ 450,522