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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)

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