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Stock-Based Employee Compensation (Stock Option Compensation Cost) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 24, 2015
Mar. 25, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock compensation cost $ 580us-gaap_AllocatedShareBasedCompensationExpense $ 573us-gaap_AllocatedShareBasedCompensationExpense
Restaurant Operating Expenses [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock compensation cost 108us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember		 98us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
General and administrative cost [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock compensation cost $ 472us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 $ 475us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember