Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income		$ 36,828	$ 33,671	$ 98,888	$ 96,974
Other comprehensive income (loss), net of tax
Unrealized (loss) gain on hedging activities, net of tax (1)	[1]	(150)	(174)	(580)	127
Foreign currency translation adjustments, net of tax (2)	[2]	990	(22,722)	2,100	(38,847)
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	2,042	3,592	5,740	9,043
Total other comprehensive income (loss), net of tax		2,882	(19,304)	7,260	(29,677)
Total comprehensive income		39,710	14,367	106,148	67,297
Unrealized (loss) gain on hedging activities, tax		1	(96)	(141)	(64)
Foreign currency translation adjustment, tax		31	(188)	105	(1,569)
Defined benefit pension and other postretirement benefits, tax		$ 977	$ 1,383	$ 2,930	$ 4,150

[1] Net of tax of $1 and $(96) for the three months ended September 30, 2016 and 2015, respectively, and $(141) and $(64) for the nine months ended September 30, 2016 and 2015, respectively.

[2] Net of tax of $31 and $(188) for the three months ended September 30, 2016 and 2015, respectively, and $105 and $(1,569) for the nine months ended September 30, 2016 and 2015, respectively.

[3] Net of tax of $977 and $1,383 for the three months ended September 30, 2016 and 2015, respectively, and $2,930 and $4,150 for the nine months ended September 30, 2016 and 2015, respectively.