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Leases, Rent (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2018
Dec. 26, 2017
Dec. 27, 2016
Rent expense for operating leases      
Contingent rent $ 1,050 $ 1,186 $ 1,175
Rent expense, occupancy 48,791 44,807 40,580
Rent expense 54,967 49,894 44,959
Occupancy      
Rent expense for operating leases      
Minimum rent 47,741 43,621 39,405
Rent expense, occupancy 48,791 44,807 40,580
Equipment and other      
Rent expense for operating leases      
Minimum rent $ 6,176 $ 5,087 $ 4,379