CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF OTHER COMPREHENSIVE INCOME [Abstract]
Net income	$ 48,565	$ 2,015
Other comprehensive income
Derivative qualifying as a cash flow hedge, net of taxes (nil)	(703)	(174)
Employee pension plan adjustments, net of taxes (1)	(6)	780
Comprehensive income	$ 47,856	$ 2,621