Stockholders Equity (Amounts Reclassified out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ (148,387)		$ (128,138)	$ (298,178)		$ (256,298)
Interest expense	(1,148)		(1,504)	(2,452)		(3,211)
Total before income tax expense	7,243		4,830	13,080		11,580
Income tax expense	(2,096)		(1,387)	(3,511)		(3,425)
Net of tax	5,147		3,443	9,569		8,155
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(487)			(1,078)
Reclassification out of Accumulated Other Comprehensive Income | Loss (gain) on cash flow hedging
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before income tax expense	(201)			(443)
Income tax expense	77			170
Net of tax	(124)			(273)
Reclassification out of Accumulated Other Comprehensive Income | Loss (gain) on cash flow hedging | Foreign exchange contracts
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(27)			(17)
Reclassification out of Accumulated Other Comprehensive Income | Loss (gain) on cash flow hedging | Interest rate contracts
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	228			460
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Plan
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before income tax expense	(627)			(1,213)
Actuarial loss	682	[1]		1,313	[1]
Prior-service credit	(55)	[1]		(100)	[1]
Income tax expense	264			408
Net of tax	$ (363)			$ (805)

[1] These accumulated other comprehensive income components are included in the computation of pension expense. See Note 13 for a discussion of the Company's pension expense.