Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 28, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 381,600	$ 368,891
Accumulated impairment of goodwill	(151,229)	(151,229)
Total	230,371	217,662
Photonics
Goodwill [Line Items]
Goodwill	168,698	168,955
Accumulated impairment of goodwill	(102,461)	(102,461)
Total	66,237	66,494
Vision
Goodwill [Line Items]
Goodwill	160,661	155,017
Accumulated impairment of goodwill	(31,722)	(31,722)
Total	128,939	123,295
Precision Motion
Goodwill [Line Items]
Goodwill	52,241	44,919
Accumulated impairment of goodwill	(17,046)	(17,046)
Total	$ 35,195	$ 27,873

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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