Financial Instruments (Effective Portion Of Pre-Tax Gains (Losses) On Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains (losses) on derivative instruments	$ 144	$ 182
Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gains (losses) on derivative instruments	50	182
Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive income	72	31
Effective portion reclassified from other comprehensive income	$ (36)	$ (35)