CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 31,218	$ 13,259
Foreign currency translation adjustment	(13,259)	(6,894)
Pension and other postretirement benefits:
Amortization of loss, net of tax (Note 4)	63	66
Derivative instrument designated as cash flow hedge:
Change in unrealized loss before reclassifications, net of tax (Note 4)	0	(1,249)
Unrealized gain reclassified into earnings, net of tax (Note 4)	0	(67)
Other comprehensive income (loss)	(13,196)	(8,144)
Comprehensive income	$ 18,022	$ 5,115