Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (78,181)	$ (49,219)	$ (47,630)	$ (46,261)	$ (84,899)	$ (52,227)	$ (43,297)	$ (45,519)	$ (711,375)		$ (647,422)	$ (580,815)
Interest expense									(4,775)		(6,088)	(8,789)
Income from continuing operations before income tax provision									55,720		58,028	112,221
Income tax expense (benefit)									(11,270)		(15,865)	(32,751)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax									1,253
Loss (gain) on cash flow hedging | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income tax provision									247
Income tax expense (benefit)									(95)
Net of tax									152
Loss (gain) on cash flow hedging | Reclassification out of Accumulated Other Comprehensive Income | Foreign Exchange Contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales									(213)
Loss (gain) on cash flow hedging | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Contract
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									460
Pension and postretirement plan | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from continuing operations before income tax provision									1,841
Income tax expense (benefit)									(740)
Net of tax									1,101
Actuarial loss									1,995	[1]
Prior-service credit									$ (154)	[1]

[1] These AOCI components are included in the computation of pension expense. See Note 16 for a discussion of the Company's pension expense.