CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
NET INCOME	$ 4,888	$ 9,954
Pension and other postretirement benefit plans:
Net actuarial loss, net of tax of: (2019 – $230; 2018 – $899)	661	2,590
Pension settlement expense, net of tax of: (2019 – $349; 2018 – $168)	1,007	486
Amortization of unrecognized net periodic benefit costs, net of tax of: (2019 – $100; 2018 – $219)
Net actuarial loss	295	649
Prior service credit	(6)	(17)
Interest rate swap and foreign currency translation:
Change in unrealized income (loss) on interest rate swap, net of tax of: (2019 – $118)	(332)
Change in unrealized income (loss) on interest rate swap, net of tax of: (2018 – $219)		436
Change in foreign currency translation, net of tax of: (2019 – $79; 2018 – $223)	225	(72)
OTHER COMPREHENSIVE INCOME, net of tax	1,850	4,072
TOTAL COMPREHENSIVE INCOME	$ 6,738	$ 14,026