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Goodwill By Reportable Segment (Details) - USD ($)
$ in Thousands
Mar. 29, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill $ 368,854 $ 368,891
Accumulated impairment of goodwill (151,229) (151,229)
Total 217,625 217,662
Photonics    
Goodwill [Line Items]    
Goodwill 169,724 168,955
Accumulated impairment of goodwill (102,461) (102,461)
Total 67,263 66,494
Vision    
Goodwill [Line Items]    
Goodwill 153,953 155,017
Accumulated impairment of goodwill (31,722) (31,722)
Total 122,231 123,295
Precision Motion    
Goodwill [Line Items]    
Goodwill 45,177 44,919
Accumulated impairment of goodwill (17,046) (17,046)
Total $ 28,131 $ 27,873