Discontinued Operations (Statement of Operations Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 26,543	$ 29,380	$ 82,099	$ 106,421
Cost of sales	26,255	27,050	78,310	94,124
Selling, general and administrative expenses	1,329	1,478	3,828	6,733
Amortization of intangible assets	55	50	165	160
Restructuring and other charges, net (1)	6,894	88	9,475	89
Other (income) expense, net	(55)	518	(8)	803
(Loss) income from discontinued operations	(7,935)	196	(9,671)	4,512
Gain (loss) on sale of discontinued operations	0	1,176	0	(97)
(Loss) income from discontinued operations before income taxes	(7,935)	1,372	(9,671)	4,415
Income tax expense	672	0	0	1,372
(Loss) income from discontinued operations, net of taxes	$ (8,607)	$ 1,372	$ (9,671)	$ 3,043
Discontinued operations per share - basic	$ (1.00)	$ 0.16	$ (1.13)	$ 0.36
Discontinued operations per share - diluted	$ (1.00)	$ 0.16	$ (1.13)	$ 0.31