Derivative Instruments (Change In Unrealized Pre-Tax Losses Included In Other Comprehensive Income Due To Fluctuations In Interest Rates And Foreign Exchange Rates) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Derivative [Line Items]
Total change in unrealized pre-tax losses from derivative instruments (effective portion)	$ (662)	$ 162	$ (473)	$ 766
Interest Rate Swaps [Member]
Derivative [Line Items]
Total change in unrealized pre-tax losses from derivative instruments (effective portion)	(378)	320	(438)	999
Foreign Currency Forwards [Member]
Derivative [Line Items]
Total change in unrealized pre-tax losses from derivative instruments (effective portion)	$ (284)	$ (158)	$ (35)	$ (233)