Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (15,946)	$ 25,003	$ (121,447)	$ 273,242
Unrealized gains on marketable securities, net of taxes of $0 and $0, respectively	0	(31)	0	(31)
Foreign currency translation adjustments	(1,017)	(338)	(984)	(1,442)
Other comprehensive loss	(1,017)	(369)	(984)	(1,473)
Comprehensive income (loss) attributable to the Company	$ (16,963)	$ 24,634	$ (122,431)	$ 271,769