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Depreciation and Amortization Expenses by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 03, 2020 | Mar. 29, 2019
Depreciation and Amortization Expenses |  |
Depreciation and amortization expenses | $ 9,330 | $ 9,074
Unallocated Corporate and Shared Services |  |
Depreciation and Amortization Expenses |  |
Depreciation and amortization expenses | 51 | 55
Photonics | Operating Segments |  |
Depreciation and Amortization Expenses |  |
Depreciation and amortization expenses | 2,649 | 2,621
Vision | Operating Segments |  |
Depreciation and Amortization Expenses |  |
Depreciation and amortization expenses | 5,277 | 5,029
Precision Motion | Operating Segments |  |
Depreciation and Amortization Expenses |  |
Depreciation and amortization expenses | $ 1,353 | $ 1,369

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