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Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands | Oct. 01, 2021 | Dec. 31, 2020
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 644,169 | $ 437,209
Accumulated impairment of goodwill | (151,229) | (151,229)
Total | 492,940 | 285,980
Photonics |  |
Goodwill [Line Items] |  |
Goodwill | 215,453 | 218,517
Accumulated impairment of goodwill | (102,461) | (102,461)
Total | 112,992 | 116,056
Vision |  |
Goodwill [Line Items] |  |
Goodwill | 161,885 | 165,195
Accumulated impairment of goodwill | (31,722) | (31,722)
Total | 130,163 | 133,473
Precision Motion |  |
Goodwill [Line Items] |  |
Goodwill | 266,831 | 53,497
Accumulated impairment of goodwill | (17,046) | (17,046)
Total | $ 249,785 | $ 36,451

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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