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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	$ 32,764	$ 10,589	$ (32,415)	$ 4,876
Other comprehensive income (loss)
Change in net unrealized gain (loss) on investments, net of tax	375	6,831	(1,519)	3,564
Change in foreign currency translation adjustments, net of tax	(107)	381	(981)	(618)
Other comprehensive income (loss)	268	7,212	(2,500)	2,946
Total comprehensive income (loss)	$ 33,032	$ 17,801	$ (34,915)	$ 7,822

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