Stockholders Equity (Amounts Reclassified out of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 149,791	$ 128,160
Interest expense	1,304	1,707
Income tax expense	1,415	2,038
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	591
Reclassification out of Accumulated Other Comprehensive Income | Gain (Loss) on Cash Flow Hedging
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before income tax expense	242
Income tax expense	93
Net of tax	149
Reclassification out of Accumulated Other Comprehensive Income | Gain (Loss) on Cash Flow Hedging | Foreign Exchange Contract
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	10
Reclassification out of Accumulated Other Comprehensive Income | Gain (Loss) on Cash Flow Hedging | Interest Rate Contract
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	232
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Plan
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Actuarial gain/(loss)	631
Prior-service cost	(45)
Total before income tax expense	586
Income tax expense	144
Net of tax	$ 442