Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 45,027	$ 33,212	$ 83,330	$ 62,060
Other comprehensive income (loss), net of tax
Unrealized losses on hedging activities, net of tax (1)	[1]	(544)	(282)	(461)	(430)
Foreign currency translation adjustments, net of tax (2)	[2]	41,562	(19,603)	60,172	1,110
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	671	2,378	1,936	3,697
Total other comprehensive income (loss), net of tax		41,689	(17,507)	61,647	4,377
Total comprehensive income		86,716	15,705	144,977	66,437
Unrealized (loss) income on hedging activities, tax		(250)	(79)	(212)	(141)
Foreign currency translation adjustment, tax		314	(83)	380	74
Defined benefit pension and other postretirement benefits, tax		$ 989	$ 1,018	$ 1,890	$ 1,953

[1] Net of tax of $(250) and $(79) for the three months ended June 30, 2017 and 2016, respectively, and $(212) and $(141) for the six months ended June 30, 2017 and 2016, respectively.

[2] Net of tax of $314 and $(83) for the three months ended June 30, 2017 and 2016, respectively, and $380 and $74 for the six months ended June 30, 2017 and 2016, respectively.

[3] Net of tax of $989 and $1,018 for the three months ended June 30, 2017 and 2016, respectively, and $1,890 and $1,953 for the six months ended June 30, 2017 and 2016, respectively.