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Discontinued Operations (Details) - Discontinued Operations [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Income Statement and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net sales $ 0 $ 15,587 $ 6,865 $ 15,587
Cost of sales 0 9,996 4,507 9,996
Gross profit 0 5,591 2,358 5,591
Selling, general and administrative expenses 0 3,570 3,729 3,570
Operating profit (loss) 0 2,021 (1,371) 2,021
Other expenses 0 495 303 495
Net (loss) on disposal of businesses 0 0 (242) 0
Income (loss) from discontinued operations before income tax expense 0 1,526 (1,916) 1,526
Income tax expense 0 458 181 458
Net income (loss) from discontinued operations, net of tax $ 0 $ 1,068 $ (2,097) $ 1,068