Accumulated Other Comprehensive Loss (Table 2 Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassfications out of accumulated other comprehensive loss, net of tax			$ 444	$ 11
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amortization of unrecognized prior service costs	$ 7	$ 5	20	17
Amortization of unrecognized cumulative actuarial net loss	158	3	475	9
Total before tax	165	8	495	26
Tax expense	(20)	(5)	(51)	(15)
Reclassfications out of accumulated other comprehensive loss, net of tax	$ 145	$ 3	$ 444	$ 11