Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
NET LOSS	$ (73,011)	$ (41,970)	$ (113,698)	$ (76,073)
Other comprehensive income (loss):
Pension obligation adjustment, net of tax		192		(18)
TOTAL COMPREHENSIVE LOSS	$ (73,011)	$ (41,778)	$ (113,698)	$ (76,091)