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Leases - Rental Expenses and Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2018
Dec. 27, 2017
Rental expense:    
Total rental expense $ 31,083 $ 33,021
Rental income:    
Base rents 22,831 25,781
Contingent rents 4,662 5,042
Total rental income 27,493 30,823
Included as a component of occupancy:    
Rental expense:    
Base rents 10,272 9,315
Contingent rents 3,074 3,168
Included as a component of costs of franchise and license expense:    
Rental expense:    
Base rents 15,108 17,674
Contingent rents $ 2,629 $ 2,864