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

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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