Derivative Instruments And Hedging Activities (Gain (Loss) On Derivative Cash Flow Hedges Recognized In OCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Mar. 27, 2011
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain/(Loss) Recognized in OCI	$ (6,545)	$ (10,206)
Foreign Currency Contracts [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of (Loss) Recognized in OCI	(6,215)	(10,161)
Natural Gas Contracts [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of (Loss) Recognized in OCI	(315)	(37)
Interest Rate Swaps - Unsecured Commercial Paper [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of (Loss) Recognized in OCI	$ (15)	$ (8)