Discontinued Operations (Statement of Operations Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 0	$ 44,166	$ 6,637	$ 137,092
Cost of sales	0	37,679	6,625	117,110
Selling, general and administrative expenses	0	5,187	2,242	15,321
Amortization of intangible assets	0	539	0	1,617
Restructuring and other charges	0	31	1	379
Interest expense, net	0	28	7	92
Other expense (income), net	490	(149)	728	(578)
(Loss) income from discontinued operations	(490)	851	(2,966)	3,151
Gain (loss) on sale of discontinued operations	1,176	0	(97)	0
Income (loss) from discontinued operations before income taxes	686	851	(3,063)	3,151
Income tax expense	0	532	1,372	1,382
Income (loss) from discontinued operations, net of taxes	$ 686	$ 319	$ (4,435)	$ 1,769
Discontinued operations per share - basic	$ 0.08	$ 0.04	$ (0.52)	$ 0.21
Discontinued operations per share - diluted	$ 0.08	$ 0.04	$ (0.46)	$ 0.21