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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 33,004	$ (49,439)	$ (130,657)	$ 21,153
Other comprehensive income (loss):
Foreign currency translation adjustments (Note 1)	(2,038)	623	(3,372)	734
Available-for-sale investments:
Unrealized gain (loss) on investments, net of tax effect	(657)	(385)	(137)	712
Other comprehensive income (loss), net of taxes	(2,695)	238	(3,509)	1,446
Comprehensive income (loss)	$ 30,309	$ (49,201)	$ (134,166)	$ 22,599

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