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Leases (Rent) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2016
Dec. 29, 2015
Dec. 30, 2014
Rent expense for operating leases      
Minimum rent-occupancy $ 39,405 $ 36,104 $ 32,288
Contingent rent 1,175 1,079 886
Rent expense, occupancy 40,580 37,183 33,174
Minimum rent-equipment and other 4,379 3,952 3,724
Rent expense $ 44,959 $ 41,135 $ 36,898