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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 956 $ 959 $ 6,759 $ 7,400
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of granted stock options     7,206 7,720
Unrecognized compensation cost 4,103   $ 4,103  
Weighted-Average Remaining Service Period (years)     1 year 2 months 29 days  
Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Adjusted fair value of granted restricted stock units     $ 0 $ 712
Unrecognized compensation cost $ 474   $ 474  
Weighted-Average Remaining Service Period (years)     9 months 18 days