CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 14,793	$ 39,632
Other comprehensive income
Current period pension and postretirement plan adjustment, net of $213 tax benefit and $226 tax expense in 2020 and 2019, respectively	(697)	758
Pension settlement, net of $202 tax benefit in 2019	0	671
Reclassification of pension and postretirement adjustments into earnings, net of $129 and $90 tax benefit in 2020 and 2019, respectively	435	845
Total other comprehensive income	(262)	2,274
Comprehensive income	$ 14,531	$ 41,906