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Goodwill By Reportable Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Goodwill $ 301,507 $ 259,357
Accumulated impairment of goodwill (151,229) (151,229)
Total 150,278 108,128
Photonics    
Goodwill [Line Items]    
Goodwill 168,452 136,278
Accumulated impairment of goodwill (102,461) (102,461)
Total 65,991 33,817
Vision    
Goodwill [Line Items]    
Goodwill 99,092 89,116
Accumulated impairment of goodwill (31,722) (31,722)
Total 67,370 57,394
Precision Motion    
Goodwill [Line Items]    
Goodwill 33,963 33,963
Accumulated impairment of goodwill (17,046) (17,046)
Total $ 16,917 $ 16,917