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Goodwill Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 28, 2019
Dec. 29, 2018
Goodwill [Abstract]    
Goodwill $ 21,997 $ 23,297
Adjustments to goodwill from finalization of purchase price allocation (651)  
Foreign currency translation adjustment $ (649)