Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 76,388	$ 88,132
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	(1,841)	278
Unrealized gain on available-for-sale securities, net of income taxes	0	100
Other comprehensive income (loss), net of income taxes	(1,841)	378
Comprehensive income	$ 74,547	$ 88,510