Accumulated Other Comprehensive Loss (Table 2 Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassfications out of accumulated other comprehensive loss, net of tax			$ 299	$ 8
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	$ 6	$ 6	13	12
Amortization of unrecognized cumulative actuarial net loss	159	3	317	6
Total before tax	165	9	330	18
Tax expense	(14)	(4)	(31)	(10)
Reclassfications out of accumulated other comprehensive loss, net of tax	$ 151	$ 5	$ 299	$ 8