CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract]
Net income (loss)	$ 783	$ (3,064)	$ (967)	$ (8,531)
Other comprehensive income
Derivative qualifying as a cash flow hedge, net of taxes (nil)	(95)	0	(843)	0
Employee pension plan adjustments, net of taxes (nil)	140	154	280	308
Comprehensive income (loss)	$ 828	$ (2,910)	$ (1,530)	$ (8,223)