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Stock-Based Compensation (RSU's Vested) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Value of shares vested $ 654 $ 0 $ 223