Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 10,476	$ 2,338	$ 17,478	$ (33,254)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation	(271)	467	136	301
Change in fair value of available for sale securities	(39)	534	(108)	311
Total other comprehensive income (loss)	(310)	1,001	28	612
Comprehensive income (loss)	10,166	3,339	17,506	(32,642)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(2,612)		(4,185)
Comprehensive income (loss) attributable to common stockholders	$ 7,554	$ 3,339	$ 13,321	$ (32,642)