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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 (loss)	$ 9,641	$ (84,448)	$ 61,605	$ (247,721)
Other comprehensive income (loss):
Unrealized gains (losses) on investments	(178)	(2,806)	83	796
Reclassification adjustment for net investment (gains) losses included in net loss	0	(62)	0	372
Net unrealized gains (losses) on investments	(178)	(2,868)	83	1,168
Currency translation adjustments	29	107	58	17
Total other comprehensive income (loss)	(149)	(2,761)	141	1,185
Comprehensive income (loss)	$ 9,492	$ (87,209)	$ 61,746	$ (246,536)

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