Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 180,366	$ 138,431
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(541)	(2,739)
Net change in unrealized gains (losses) on available-for-sale securities	(561)	3,424
Other comprehensive income (loss)	(1,102)	685
Comprehensive income	$ 179,264	$ 139,116