CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)	$ 2,426	$ 783	$ 6,915	$ (967)
Other comprehensive income (loss)
Derivative qualifying as a cash flow hedge, net of taxes (nil)	49	(95)	260	(843)
Employee pension plan adjustments, net of taxes (nil)	(134)	140	(268)	280
Comprehensive income (loss)	$ 2,341	$ 828	$ 6,907	$ (1,530)