CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 47,319	$ 87,651	$ 80,459
Foreign currency translation adjustment	(4,990)	(12,505)	28,463
Pension and other postretirement benefits:
Pension settlement charges, net of tax (Note 4)	43,934	0	0
Actuarial net loss incurred, net of tax (Note 4)	(6,079)	(1,678)	(1,481)
Amortization of loss, net of tax (Note 4)	390	176	99
Derivative instrument designated as cash flow hedge:
Change in unrealized (loss) gain before reclassifications, net of tax (Note 4)	(1,171)	519	(6)
Unrealized (gain) loss reclassified into earnings, net of tax (Note 4)	(155)	(191)	32
Other comprehensive income (loss)	31,929	(13,679)	27,107
Comprehensive income	$ 79,248	$ 73,972	$ 107,566