Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 158,350	$ 166,186	$ 59,415
Other comprehensive (loss) income, net of tax
Unrealized (loss) gain hedging activities, net of tax	[1]	(949)	673	299
Foreign currency translation adjustments, net of tax	[2]	(13,689)	(50,017)	83,404
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	(5,357)	(15,426)	10,726
Total other comprehensive (loss) income, net of tax		(19,995)	(64,770)	94,429
Total comprehensive income		138,355	101,416	153,844
Unrealized (loss) gain on hedging activities, tax		(326)	207	232
Foreign currency translation adjustment, tax		(108)	(210)	610
Defined benefit pension and other postretirement benefits, tax		$ (1,420)	$ (4,606)	$ 4,469

[1] Net of tax of $(326), $207 and $232 for the years ended December 31, 2019, 2018 and 2017, respectively.

[2] Net of tax of $(108), $(210) and $610 for the years ended December 31, 2019, 2018 and 2017, respectively.

[3] Net of tax of $(1,420), $(4,606) and $4,469 for the years ended December 31, 2019, 2018 and 2017, respectively.