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Revenue, Gross Profit, Gross Profit Margin and Operating Income (Loss) from Continuing Operations by Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Segment Reporting Information [Line Items]    
Revenue $ 108,974 $ 90,316
Gross Profit $ 46,094 $ 36,892
Gross profit margin percentage 42.30% 40.80%
Operating Income (Loss) from Continuing Operations $ 10,212 $ 2,587
Photonics    
Segment Reporting Information [Line Items]    
Revenue 50,736 40,358
Gross Profit $ 21,789 $ 17,997
Gross profit margin percentage 42.90% 44.60%
Operating Income (Loss) from Continuing Operations $ 8,080 $ 6,856
Vision    
Segment Reporting Information [Line Items]    
Revenue 32,762 28,862
Gross Profit $ 13,146 $ 9,579
Gross profit margin percentage 40.10% 33.20%
Operating Income (Loss) from Continuing Operations $ 1,525 $ (3,771)
Precision Motion    
Segment Reporting Information [Line Items]    
Revenue 25,476 21,096
Gross Profit $ 11,518 $ 9,668
Gross profit margin percentage 45.20% 45.80%
Operating Income (Loss) from Continuing Operations $ 7,164 $ 5,235
Unallocated Corporate and Shared Services    
Segment Reporting Information [Line Items]    
Gross Profit (359) (352)
Operating Income (Loss) from Continuing Operations $ (6,557) $ (5,733)