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Stock Based Compensation (Schedule of Share Based Compensation Included in Net Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share based compensation $ 9,310 $ 10,316 $ 8,765
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share based compensation 7,283 7,801 7,550
Common Stock Subject to Vesting Requirements [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share based compensation $ 2,027 $ 2,515 $ 1,215