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Income Taxes (Unrecognized) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2016
Dec. 29, 2015
Reconciliation of the beginning and ending liability for unrecognized tax benefits    
Balance at the beginning of the period $ 405 $ 114
Additions to tax positions related to prior years 23 315
Additions to tax positions related to current year 274 85
Reductions due to statute expiration (4) (11)
Reductions due to exam settlement (187) (98)
Balance at the end of the period $ 511 $ 405