Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 567	$ 37,616	$ 30,300	$ 71,608
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on hedging activities, net of tax	[1]	811	(1,225)	(1,526)	(1,793)
Foreign currency translation adjustments, net of tax	[2]	20,256	4,001	(16,077)	(5,224)
Defined benefit pension and other postretirement benefits, net of tax	[3]	(4,023)	1,922	458	3,537
Total other comprehensive income (loss), net of tax		17,044	4,698	(17,145)	(3,480)
Total comprehensive income		17,611	42,314	13,155	68,128
Unrealized (loss) income on hedging activities, tax		269	(380)	(554)	(555)
Foreign currency translation adjustment, tax		0	67	(66)	(33)
Defined benefit pension and other postretirement benefits, tax		$ (1,198)	$ 569	$ (388)	$ 1,109

[1] Net of tax of $269 and $(380) for the three months ended June 30, 2020 and 2019, respectively, and $(554) and $(555) for the six months ended June 30, 2020 and 2019, respectively.

[2] Net of tax of $0 and $67 for the three months ended June 30, 2020 and 2019, respectively, and $(66) and $(33) for the six months ended June 30, 2020 and 2019, respectively.

[3] Net of tax of $(1,198) and $569 for the three months ended June 30, 2020 and 2019, respectively, and $(388) and $1,109 for the six months ended June 30, 2020 and 2019, respectively.