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Segment Information (Tables) | 9 Months Ended
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Sep. 28, 2018
Segment Reporting [Abstract] |
Revenue, Gross Profit, Gross Profit Margin, Operating Income (Loss), and Depreciation and Amortization Expenses by Reportable Segment | Revenue, gross profit, gross profit margin, operating income (loss), and depreciation and amortization expenses by reportable segment were as follows (in thousands, except percentage data):
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Photonics | $ | 61,285 |  |  | $ | 61,882 |  |  | $ | 187,178 |  |  | $ | 170,503 |
Vision |  | 62,113 |  |  |  | 58,150 |  |  |  | 172,145 |  |  |  | 124,943 |
Precision Motion |  | 37,396 |  |  |  | 26,264 |  |  |  | 98,836 |  |  |  | 78,926 |
Total | $ | 160,794 |  |  | $ | 146,296 |  |  | $ | 458,159 |  |  | $ | 374,372 |
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Gross Profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Photonics | $ | 29,218 |  |  | $ | 28,966 |  |  | $ | 89,510 |  |  | $ | 77,423 |
Vision |  | 24,160 |  |  |  | 19,792 |  |  |  | 64,322 |  |  |  | 47,378 |
Precision Motion |  | 16,788 |  |  |  | 10,291 |  |  |  | 44,750 |  |  |  | 34,558 |
Unallocated Corporate and Shared Services |  | (532 | ) |  |  | (342 | ) |  |  | (1,560 | ) |  |  | (1,069 | )
Total | $ | 69,634 |  |  | $ | 58,707 |  |  | $ | 197,022 |  |  | $ | 158,290 |
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Gross Profit Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Photonics |  | 47.7 | % |  |  | 46.8 | % |  |  | 47.8 | % |  |  | 45.4 | %
Vision |  | 38.9 | % |  |  | 34.0 | % |  |  | 37.4 | % |  |  | 37.9 | %
Precision Motion |  | 44.9 | % |  |  | 39.2 | % |  |  | 45.3 | % |  |  | 43.8 | %
Total |  | 43.3 | % |  |  | 40.1 | % |  |  | 43.0 | % |  |  | 42.3 | %
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Photonics | $ | 14,595 |  |  | $ | 15,367 |  |  | $ | 46,102 |  |  | $ | 36,138 |
Vision |  | 5,380 |  |  |  | 846 |  |  |  | 6,246 |  |  |  | 4,893 |
Precision Motion |  | 8,818 |  |  |  | 5,493 |  |  |  | 25,037 |  |  |  | 20,238 |
Unallocated Corporate and Shared Services |  | (7,798 | ) |  |  | (9,299 | ) |  |  | (22,048 | ) |  |  | (22,776 | )
Total | $ | 20,995 |  |  | $ | 12,407 |  |  | $ | 55,337 |  |  | $ | 38,493 |
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Depreciation and Amortization Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Photonics | $ | 2,997 |  |  | $ | 3,666 |  |  | $ | 9,030 |  |  | $ | 10,693 |
Vision |  | 5,100 |  |  |  | 4,362 |  |  |  | 15,371 |  |  |  | 9,276 |
Precision Motion |  | 1,020 |  |  |  | 588 |  |  |  | 2,364 |  |  |  | 1,746 |
Unallocated Corporate and Shared Services |  | 82 |  |  |  | 248 |  |  |  | 621 |  |  |  | 725 |
Total | $ | 9,199 |  |  | $ | 8,864 |  |  | $ | 27,386 |  |  | $ | 22,440 |
Schedule of Geographic Revenue | The Company aggregates geographic revenue based on the customer location where products are shipped. Revenue from these customers was as follows (in thousands):
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
United States | $ | 63,073 |  |  | $ | 58,949 |  |  | $ | 181,653 |  |  | $ | 157,778 |
Germany |  | 23,089 |  |  |  | 17,728 |  |  |  | 64,170 |  |  |  | 46,807 |
Rest of Europe |  | 30,222 |  |  |  | 27,152 |  |  |  | 80,629 |  |  |  | 55,164 |
China |  | 17,516 |  |  |  | 15,459 |  |  |  | 51,486 |  |  |  | 40,920 |
Rest of Asia-Pacific |  | 24,882 |  |  |  | 23,769 |  |  |  | 74,589 |  |  |  | 64,511 |
Other |  | 2,012 |  |  |  | 3,239 |  |  |  | 5,632 |  |  |  | 9,192 |
Total | $ | 160,794 |  |  | $ | 146,296 |  |  | $ | 458,159 |  |  | $ | 374,372 |
Revenue By End Market | The Company primarily operates in two end markets: the advanced industrial market and the medical market. Revenue by end market was approximately as follows:
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Advanced Industrial |  | 50 | % |  |  | 50 | % |  |  | 50 | % |  |  | 55 | %
Medical |  | 50 | % |  |  | 50 | % |  |  | 50 | % |  |  | 45 | %
Total |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

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