CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (15,629)	$ (88,572)
Other comprehensive income (loss), before taxes:
Share of other comprehensive income of equity method investments	113	318
Total comprehensive loss	$ (15,516)	$ (88,254)