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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

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