Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 369,553	$ 362,217
Accumulated impairment of goodwill	(151,229)	(151,229)
Total	218,324	210,988
Photonics
Goodwill [Line Items]
Goodwill	169,768	170,818
Accumulated impairment of goodwill	(102,461)	(102,461)
Total	67,307	68,357
Vision
Goodwill [Line Items]
Goodwill	155,494	157,436
Accumulated impairment of goodwill	(31,722)	(31,722)
Total	123,772	125,714
Precision Motion
Goodwill [Line Items]
Goodwill	44,291	33,963
Accumulated impairment of goodwill	(17,046)	(17,046)
Total	$ 27,245	$ 16,917

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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