Derivative Instruments (Change In Unrealized Pre-Tax Gains (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
	Mar. 30, 2013	Mar. 31, 2012
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	$ (13)	$ 134
Interest Rate Swaps [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	69	(37)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(43)	23
Foreign Exchange Forward [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	(82)	171
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ 37	$ (78)