CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract]
Net income (loss)	$ 3,512	$ 1,340	$ 2,545	$ (7,192)
Other comprehensive income (loss)
Derivative qualifying as a cash flow hedge, net of taxes (nil)	57	0	(786)	0
Employee pension plan adjustments, net of taxes (nil)	140	154	420	462
Comprehensive income (loss)	$ 3,709	$ 1,494	$ 2,179	$ (6,730)