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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 1,307 $ 956 $ 6,215 $ 6,759
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value     7,200 7,206
Unrecognized compensation cost 4,419   $ 4,419  
Weighted-Average Remaining Service Period (years)     1 year 2 months 4 days  
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value     $ 76 $ 0
Unrecognized compensation cost $ 980   $ 980  
Weighted-Average Remaining Service Period (years)     1 year 1 month 9 days