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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 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Revenue $ 150,400 $ 119,102 $ 297,365 $ 228,076
Gross Profit $ 65,229 $ 53,489 $ 127,388 $ 99,583
Gross profit margin percentage 43.40% 44.90% 42.80% 43.70%
Operating Income (Loss) $ 17,115 $ 15,747 $ 34,342 $ 26,086
Photonics        
Segment Reporting Information [Line Items]        
Revenue 64,062 57,885 125,893 108,621
Gross Profit $ 30,737 $ 26,668 $ 60,292 $ 48,457
Gross profit margin percentage 48.00% 46.10% 47.90% 44.60%
Operating Income (Loss) $ 16,184 $ 12,564 $ 31,507 $ 20,771
Vision        
Segment Reporting Information [Line Items]        
Revenue 53,823 34,031 110,032 66,793
Gross Profit $ 20,441 $ 14,440 $ 40,162 $ 27,586
Gross profit margin percentage 38.00% 42.40% 36.50% 41.30%
Operating Income (Loss) $ 391 $ 2,522 $ 866 $ 4,047
Precision Motion        
Segment Reporting Information [Line Items]        
Revenue 32,515 27,186 61,440 52,662
Gross Profit $ 14,702 $ 12,749 $ 27,962 $ 24,267
Gross profit margin percentage 45.20% 46.90% 45.50% 46.10%
Operating Income (Loss) $ 7,612 $ 7,581 $ 16,219 $ 14,745
Unallocated Corporate and Shared Services        
Segment Reporting Information [Line Items]        
Gross Profit (651) (368) (1,028) (727)
Operating Income (Loss) $ (7,072) $ (6,920) $ (14,250) $ (13,477)