Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands	Jul. 03, 2020	Dec. 31, 2019	Jul. 31, 2019
Goodwill [Line Items]
Goodwill	$ 425,046	$ 425,939
Accumulated impairment of goodwill	(151,229)	(151,229)
Total	273,817	274,710	$ 44,162
Photonics
Goodwill [Line Items]
Goodwill	212,876	213,413
Accumulated impairment of goodwill	(102,461)	(102,461)
Total	110,415	110,952
Vision
Goodwill [Line Items]
Goodwill	160,320	160,086
Accumulated impairment of goodwill	(31,722)	(31,722)
Total	128,598	128,364
Precision Motion
Goodwill [Line Items]
Goodwill	51,850	52,440
Accumulated impairment of goodwill	(17,046)	(17,046)
Total	$ 34,804	$ 35,394

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.

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))
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Amount before 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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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