CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)	$ 2,015	$ (6,545)	$ (11,484)
Other comprehensive income (loss)
Derivative qualifying as cash flow hedge	(174)	0	0
Employee pension plan adjustments	780	448	1,591
Comprehensive income (loss)	$ 2,621	$ (6,097)	$ (9,893)