CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (80,127)	$ (109,544)	$ 55,588
Other comprehensive income (loss):
Foreign currency translation adjustment	3,376	(5,880)	(17,952)
Reclassification of China cumulative translation gain to Net Loss upon substantial liquidation		(8,853)
Deferred income taxes			(1,756)
Other comprehensive income (loss), net of tax	3,376	(14,733)	(19,708)
Comprehensive (loss) income	$ (76,751)	$ (124,277)	$ 35,880