Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 419,948	$ 425,939
Accumulated impairment of goodwill	(151,229)	(151,229)
Total	268,719	274,710
Photonics
Goodwill [Line Items]
Goodwill	210,107	213,413
Accumulated impairment of goodwill	(102,461)	(102,461)
Total	107,646	110,952
Vision
Goodwill [Line Items]
Goodwill	158,347	160,086
Accumulated impairment of goodwill	(31,722)	(31,722)
Total	126,625	128,364
Precision Motion
Goodwill [Line Items]
Goodwill	51,494	52,440
Accumulated impairment of goodwill	(17,046)	(17,046)
Total	$ 34,448	$ 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.

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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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Amount of accumulated impairment loss for 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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