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Leases - Rent expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2018
Mar. 26, 2019
Leases    
Rent expense $ 13,411  
Term (in years)   1 year
Minimum    
Leases    
Term (in years)   10 years
Lease renewal term   1 year
Maximum    
Leases    
Term (in years)   15 years
Lease renewal term   5 years
Occupancy    
Leases    
Minimum rent 11,533  
Contingent rent 318  
Rent expense 11,851  
Equipment and other    
Leases    
Minimum rent $ 1,560