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Leases (Details2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 25, 2012
Dec. 27, 2011
Dec. 28, 2010
Rent expense for operating leases      
Contingent rent $ 687 $ 618 $ 518
Rent expense, occupancy 25,797 23,150 21,361
Rent expense 29,190 26,163 23,974
Occupancy
     
Rent expense for operating leases      
Minimum rent 25,110 22,532 20,843
Equipment and other
     
Rent expense for operating leases      
Minimum rent $ 3,393 $ 3,013 $ 2,613