Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 166,186	$ 59,415	$ 135,601
Other comprehensive (loss) income, net of tax
Unrealized gain (loss) hedging activities, net of tax (1)	[1]	673	299	(342)
Unrealized (loss) gain on hedging activities, tax		207	232	(42)
Foreign currency translation adjustments, net of tax (2)	[2]	(50,017)	83,404	(48,367)
Foreign currency translation adjustment, tax		(210)	610	(833)
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	(15,426)	10,726	(8,867)
Defined benefit pension and other postretirement benefits, tax		(4,606)	4,469	(4,687)
Total other comprehensive (loss) income, net of tax		(64,770)	94,429	(57,576)
Total comprehensive income		$ 101,416	$ 153,844	$ 78,025

[1] Net of tax of $207, $232 and $(42) for the years ended December 31, 2018, 2017 and 2016, respectively.

[2] Net of tax of $(210), $610 and $(833) for the years ended December 31, 2018, 2017 and 2016, respectively.

[3] Net of tax of $(4,606), $4,469 and $(4,687) for the years ended December 31, 2018, 2017 and 2016, respectively.