Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 8,175	$ 91,028	$ 84,563	$ 179,160
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	1,055	555	(786)	833
Unrealized gain on available-for-sale securities, net of income taxes	0	42	0	142
Other comprehensive income (loss), net of income taxes	1,055	597	(786)	975
Comprehensive income	$ 9,230	$ 91,625	$ 83,777	$ 180,135