Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

v3.10.0.1
Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 30, 2018
Sep. 24, 2017
Sep. 28, 2018
Stock-based compensation $ 811 $ 747 $ 2,368 $ 2,102  
ShareBasedCompensationArrangementByShareBasedPaymentAwardEstimatedFairValueOfCommonStockPerShare         $ 26.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     286    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 260    
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 8   $ 8    
2012 Omnibus Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 496,379   496,379    
2012 Omnibus Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 8,300   $ 8,300    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     5 years    
Minimum [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years    
Maximum [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years