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Leases (Net Rental Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Rental Expense:      
Total rental expense $ 34,913 $ 36,780 $ 38,937
Rental income:      
Base rents 28,183 30,166 33,926
Contingent rents 5,337 5,305 4,608
Total rental income 33,520 35,471 38,534
Company-owned restaurants [Member]      
Rental Expense:      
Base rents 8,602 8,998 9,462
Contingent rents 3,351 3,134 2,688
Franchised and licensed restaurants [Member]      
Rental Expense:      
Base rents 19,883 21,751 23,940
Contingent rents $ 3,077 $ 2,897 $ 2,847