UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 37,291	$ (20,740)	$ 30,674	$ (46,112)
Other comprehensive income, net of tax
Unrealized gain on available-for-sale securities	121	0	1,131	100
Foreign currency translation adjustments	1,461	2,028	731	1,514
Total other comprehensive income, net of tax	1,582	2,028	1,862	1,614
Comprehensive income (loss)	$ 38,873	$ (18,712)	$ 32,536	$ (44,498)