Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 37,616	$ 49,429	$ 71,608	$ 88,247
Other comprehensive income (loss), net of tax
Unrealized (loss) gain on hedging activities, net of tax (1)	[1]	(1,225)	415	(1,793)	811
Foreign currency translation adjustments, net of tax (2)	[2]	4,001	(65,360)	(5,224)	(38,407)
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	1,922	3,025	3,537	6,189
Total other comprehensive income (loss), net of tax		4,698	(61,920)	(3,480)	(31,407)
Total comprehensive income (loss)		42,314	(12,491)	68,128	56,840
Unrealized (loss) income on hedging activities, tax		(380)	131	(555)	279
Foreign currency translation adjustment, tax		67	(324)	(33)	(162)
Defined benefit pension and other postretirement benefits, tax		$ 569	$ 806	$ 1,109	$ 2,063

[1] Net of tax of $(380) and $131 for the three months ended June 30, 2019 and 2018, respectively, and $(555) and $279 for the six months ended June 30, 2019 and 2018, respectively.

[2] Net of tax of $67 and $(324) for the three months ended June 30, 2019 and 2018, respectively, and $(33) and $(162) for the six months ended June 30, 2019 and 2018, respectively.

[3] Net of tax of $569 and $806 for the three months ended June 30, 2019 and 2018, respectively, and $1,109 and $2,063 for the six months ended June 30, 2019 and 2018, respectively.