CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract]
Net loss	$ (28,304)	$ (3,350)	$ (56,133)
Other comprehensive income (loss)
Employee pension plan adjustments	971	395	(3,905)
Comprehensive loss	$ (27,333)	$ (2,955)	$ (60,038)