CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (425,703)	$ (321,421)	$ 5,910
Other comprehensive income (loss), net of taxes of $0 for 2019, $0 for 2018 and $0 for 2017:
Foreign currency translation adjustment	2,991	(4,335)	7,956
Total comprehensive income (loss)	$ (422,712)	$ (325,756)	$ 13,866