CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 29,404	$ 16,270	$ 47,186	$ 45,534
Pension and other postretirement benefit plans:
Net actuarial loss, net of tax of: (2020 - Three-month period $-, Nine-month period $3; 2019 - Three-month period $310, Nine-month period $100)		(894)	(8)	(291)
Pension settlement expense, including termination expense, net of tax of: (2020 - Three-month period $-, Nine-month period $23; 2019 - Three-month period $651, Nine-month period $1,072)		5,850	66	7,063
Amortization of unrecognized net periodic benefit cost (credit), net of tax of: (2020 - Three-month period $38, Nine-month period $114; 2019 - Three-month period $75, Nine-month period $252)
Net actuarial (gain) loss	(110)	222	(327)	746
Prior service credit		(6)		(18)
Interest rate swap and foreign currency translation:
Change in unrealized loss on interest rate swap, net of tax of: (2020 - Three-month period $48, Nine-month period $366; 2019 - Three-month period $120, Nine-month period $425)	136	(338)	(1,035)	(1,198)
Change in foreign currency translation, net of tax of: (2020 - Three-month period $246, Nine-month period $94; 2019 - Three-month period $12, Nine-month period $108)	697	(35)	(266)	306
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	723	4,799	(1,570)	6,608
TOTAL COMPREHENSIVE INCOME	$ 30,127	$ 21,069	$ 45,616	$ 52,142