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Consolidated Statements of Comprehensive Income (Loss) - 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)	$ (15,170)	$ 6,721	$ (22,197)	$ 40,984
Other comprehensive income (loss), net of tax:
Unrealized holding gain	(448)	9,421	30,748	48,883
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	0	(2)	0	(4)
Reclassification adjustment for gains included in net income (loss)	(2,104)	(847)	(13,205)	(2,665)
Unrealized foreign currency translation gain (loss)	579	200	568	331
Other comprehensive income (loss), net of tax	(1,973)	8,772	18,111	46,545
Comprehensive income (loss), net of tax	$ (17,143)	$ 15,493	$ (4,086)	$ 87,529

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