Stock-Based Employee Compensation (Stock Compensation Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2016	Dec. 29, 2015	Dec. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation cost	$ 2,666	$ 2,900	$ 2,567
Restaurant Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation cost	361	468	442
General And Administrative Costs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation cost	$ 2,305	$ 2,432	$ 2,125