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Income Taxes (Unrecognized) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Reconciliation of the beginning and ending liability for unrecognized tax benefits    
Balance at the beginning of the period $ 511 $ 405
Additions to tax positions related to prior years 36 23
Additions to tax positions related to current year 389 274
Reductions due to statute expiration (2) (4)
Reductions due to exam settlement (128) (187)
Balance at the end of the period $ 806 $ 511