CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (178,465)	$ (19,950)	$ (235,731)	$ (64,930)
Other comprehensive income:
Foreign currency translation adjustment	302	263	979	2,833
Reclassification of Russia cumulative translation loss to Net Loss upon sale	33,347	0	33,347	0
Deferred income taxes	0	0	0	0
Other comprehensive income, net of tax	33,649	263	34,326	2,833
Comprehensive loss	$ (144,816)	$ (19,687)	$ (201,405)	$ (62,097)