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Leases - Rent expense (Details)
$ in Thousands
12 Months Ended
Dec. 25, 2018
USD ($)
Leases  
Rent expense $ 54,967
Occupancy  
Leases  
Minimum rent 47,741
Contingent rent 1,050
Rent expense 48,791
Equipment and other  
Leases  
Minimum rent $ 6,176