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Stock Based Compensation (Summary of Activity For Common Stock Subject To Vesting Requirements) (Details) - Common Stock Subject to Vesting Requirements [Member]
12 Months Ended
Dec. 28, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Option Shares, Beginning Balance | shares 431,024
Number of Shares, Granted | shares 7,728
Number of Shares, Vested | shares (148,589)
Number of Shares, Forfeited | shares (656)
Outstanding, Option Shares, Ending Balance | shares 289,507
Outstanding, Weighted Average Fair Value, Beginning Balance | $ / shares $ 13.52
Weighted average grant-date fair value | $ / shares 16.01
Weighted Average Grant-Date Fair Value, Vested | $ / shares 8.73
Weighted Average Grant-Date Fair Value, Forfeited | $ / shares 19.82
Outstanding, Weighted Average Fair Value, Ending Balance | $ / shares $ 16.03