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Depreciation and Amortization Expenses by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2021 | Oct. 02, 2020 | Oct. 01, 2021 | Oct. 02, 2020
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | $ 10,890 | $ 9,596 | $ 30,613 | $ 28,363
Unallocated Corporate and Shared Services |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | 59 | 67 | 201 | 160
Photonics | Operating Segments |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | 2,901 | 2,864 | 8,703 | 8,303
Vision | Operating Segments |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | 5,239 | 5,296 | 15,793 | 15,845
Precision Motion | Operating Segments |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | $ 2,691 | $ 1,369 | $ 5,916 | $ 4,055

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