Goodwill By Reportable Segment (Details) - USD ($) $ in Thousands	Sep. 28, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 371,001	$ 362,217
Accumulated impairment of goodwill	(151,229)	(151,229)
Total	219,772	210,988
Photonics
Goodwill [Line Items]
Goodwill	169,803	170,818
Accumulated impairment of goodwill	(102,461)	(102,461)
Total	67,342	68,357
Vision
Goodwill [Line Items]
Goodwill	156,129	157,436
Accumulated impairment of goodwill	(31,722)	(31,722)
Total	124,407	125,714
Precision Motion
Goodwill [Line Items]
Goodwill	45,069	33,963
Accumulated impairment of goodwill	(17,046)	(17,046)
Total	$ 28,023	$ 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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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