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Employee Benefit Plans - Components Stock-Based Compensation Expense (Details) - Selling, general and administrative expenses - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 7,027 $ 5,803 $ 5,069
RSU Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 6,838 5,621 4,848
Employee Stock Purchase Plan Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 189 182 170
Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 0 $ 0 $ 51