Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income		$ 34,227	$ 30,228	$ 63,303	$ 52,981
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on hedging activities, net of tax (1)	[1]	189	(502)	301	(529)
Foreign currency translation adjustments, net of tax (2)	[2]	23,632	(4,612)	(16,125)	(10,560)
Defined benefit pension and other postretirement benefits, net of tax (3)	[3]	1,790	1,489	5,451	(4,381)
Total other comprehensive income (loss), net of tax		25,611	(3,625)	(10,373)	(15,470)
Total comprehensive income		59,838	26,603	52,930	37,511
Unrealized (loss) income on hedging activities, tax		73	(208)	32	(194)
Foreign currency translation adjustment, tax		830	(569)	(1,381)	(767)
Defined benefit pension and other postretirement benefits, tax		$ 1,421	$ 797	$ 2,767	$ (2,990)

[1] Net of tax of $73 and $(208) for the three months ended June 30, 2015 and 2014, respectively, and $32 and $(194) for the six months ended June 30, 2015 and 2014, respectively.

[2] Net of tax of $830 and $(569) for the three months ended June 30, 2015 and 2014, respectively, and $(1,381) and $(767) for the six months ended June 30, 2015 and 2014, respectively.

[3] Net of tax of $1,421 and $797 for the three months ended June 30, 2015 and 2014, respectively, and $2,767 and $(2,990) for the six months ended June 30, 2015 and 2014, respectively.