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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 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Segment Reporting Information [Line Items]        
Revenue $ 160,794 $ 146,296 $ 458,159 $ 374,372
Gross Profit $ 69,634 $ 58,707 $ 197,022 $ 158,290
Gross profit margin percentage 43.30% 40.10% 43.00% 42.30%
Operating Income (Loss) $ 20,995 $ 12,407 $ 55,337 $ 38,493
Photonics        
Segment Reporting Information [Line Items]        
Revenue 61,285 61,882 187,178 170,503
Gross Profit $ 29,218 $ 28,966 $ 89,510 $ 77,423
Gross profit margin percentage 47.70% 46.80% 47.80% 45.40%
Operating Income (Loss) $ 14,595 $ 15,367 $ 46,102 $ 36,138
Vision        
Segment Reporting Information [Line Items]        
Revenue 62,113 58,150 172,145 124,943
Gross Profit $ 24,160 $ 19,792 $ 64,322 $ 47,378
Gross profit margin percentage 38.90% 34.00% 37.40% 37.90%
Operating Income (Loss) $ 5,380 $ 846 $ 6,246 $ 4,893
Precision Motion        
Segment Reporting Information [Line Items]        
Revenue 37,396 26,264 98,836 78,926
Gross Profit $ 16,788 $ 10,291 $ 44,750 $ 34,558
Gross profit margin percentage 44.90% 39.20% 45.30% 43.80%
Operating Income (Loss) $ 8,818 $ 5,493 $ 25,037 $ 20,238
Unallocated Corporate and Shared Services        
Segment Reporting Information [Line Items]        
Gross Profit (532) (342) (1,560) (1,069)
Operating Income (Loss) $ (7,798) $ (9,299) $ (22,048) $ (22,776)