CONDENSED 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 Comprehensive Income [Abstract]
Net income (loss)	$ 9,702	$ (23,940)	$ (31,466)	$ (267,509)
Other comprehensive loss:
Unrealized (losses) gains on securities, net of tax	(104)	(167)	171	786
Total comprehensive income (loss)	$ 9,598	$ (24,107)	$ (31,295)	$ (266,723)