Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 135,601	$ 121,380	$ 118,370
Other comprehensive loss, net of tax
Unrealized (loss) gain on hedging activities, net of tax (1)	[1]	(342)	847	(213)
Unrealized (loss) gain on hedging activities, tax		(42)	227	(45)
Foreign currency translation adjustments, net of tax (2)	[2]	(48,367)	(54,232)	(83,168)
Foreign currency translation adjustment, tax		(833)	(1,777)	(3,292)
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	(8,867)	9,586	(42,016)
Defined benefit pension and other postretirement benefits, tax		(4,687)	3,916	(24,799)
Total other comprehensive loss, net of tax		(57,576)	(43,799)	(125,397)
Total comprehensive income (loss)		$ 78,025	$ 77,581	$ (7,027)

[1] Net of tax of $(42), $227 and $(45) for the years ended December 31, 2016, 2015 and 2014, respectively.

[2] Net of tax of $(833), $(1,777) and $(3,292) for the years ended December 31, 2016, 2015 and 2014, respectively.

[3] Net of tax of $(4,687), $3,916 and $(24,799) for the years ended December 31, 2016, 2015 and 2014, respectively.