Derivative Instruments (Change In Unrealized Net of Tax Gains (Losses) Included In Other Comprehensive Income Due To Fluctuations In Interest Rates And Foreign Exchange Rates) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Derivative [Line Items]
Derivatives qualifying as hedges, net of tax, portion attributable to parent	$ 378	$ (1,138)	$ (1,249)	$ (1,134)
Interest Rate Swap
Derivative [Line Items]
Derivatives qualifying as hedges, net of tax, portion attributable to parent	378	(1,138)	(1,249)	(1,134)
Derivatives qualifying as hedges, tax, portion attributable to parent	$ (234)	$ 709	$ 794	$ 707