CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 49,166	$ 43,905	$ 55,324
Other comprehensive income (loss):
Adjustment for pension and postretirement benefit liability, net of tax of ($94) in 2019, ($558) in 2018 and ($140) in 2017	351	1,568	233
Pension termination, net of tax of ($2,237) in 2019	6,380
Adjustment for interest rate swap, net of tax of $1,211 in 2019, ($64) in 2018 and $88 in 2017	(3,496)	84	(133)
Total other comprehensive income, net of tax	3,235	1,652	100
Comprehensive income	$ 52,401	$ 45,557	$ 55,424