Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - 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)	$ 33,838	$ (8,844)	$ 30,912	$ (96,287)
Other comprehensive income (loss):
Unrealized gain on available-for-sale securities, net of income tax expense of $0, $0, $0 and $6	0	0	0	6
Loss on derivative securities, effective portion, net of income tax benefit of $0, $0, $0 and $(139)	0	0	0	(223)
Foreign currency translation, net of income tax expense (benefit) of $13, $(37), $(34) and $(101)	217	(177)	195	23
Net other comprehensive income (loss) during period	217	(177)	195	(194)
Comprehensive income (loss)	$ 34,055	$ (9,021)	$ 31,107	$ (96,481)