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Discontinued Operations (Loss from Discontinued Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss from operations of discontinued operations $ (1,374) $ (5,698) $ (7,623) $ (13,630)
Provision for income taxes 1,660 871 377 226
Loss from discontinued operations (3,034) (6,569) (8,000) (13,856)
AS&O Business [Member] | Discontinued Operations, Held-for-sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sales 88,701 81,803 178,020 160,480
Cost of sales 71,276 71,706 148,357 141,185
Gross profit 17,425 10,097 29,663 19,295
Selling, general and administrative expenses 4,096 4,578 8,905 9,283
Research, development and engineering costs 1,090 1,649 2,352 3,423
Other operating expenses 2,497 193 3,990 270
Interest expense 11,007 10,589 21,857 21,115
Other (income) loss, net 109 (1,214) 182 (1,166)
Loss from operations of discontinued operations (1,374) (5,698) (7,623) (13,630)
Provision for income taxes 1,660 871 377 226
Loss from discontinued operations $ (3,034) $ (6,569) $ (8,000) $ (13,856)