CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME [Abstract]
Net loss	$ (6,771)	$ (3,138)	$ (17,700)	$ (9,206)
Other comprehensive income
Employee pension plan adjustments	220	222	441	444
Comprehensive loss	$ (6,551)	$ (2,916)	$ (17,259)	$ (8,762)