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Leases, Rent (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Dec. 29, 2015
Rent expense for operating leases      
Minimum rent-occupancy $ 43,621 $ 39,405 $ 36,104
Contingent rent 1,186 1,175 1,079
Rent expense, occupancy 44,807 40,580 37,183
Minimum rent-equipment and other 5,087 4,379 3,952
Rent expense $ 49,894 $ 44,959 $ 41,135