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Depreciation and Amortization Expenses 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
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | $ 9,199 | $ 8,864 | $ 27,386 | $ 22,440
Photonics |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | 2,997 | 3,666 | 9,030 | 10,693
Vision |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | 5,100 | 4,362 | 15,371 | 9,276
Precision Motion |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | 1,020 | 588 | 2,364 | 1,746
Unallocated Corporate and Shared Services |  |  |  |
Depreciation and Amortization Expenses |  |  |  |
Depreciation and amortization expenses | $ 82 | $ 248 | $ 621 | $ 725

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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