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Share-based Compensation (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2011
Dec. 28, 2010
Dec. 29, 2009
Share-based compensation expenses      
Share-based compensation expense $ 10,525 $ 7,686 $ 7,493
Labor expense
     
Share-based compensation expenses      
Share-based compensation expense 3,905 3,364 2,836
General and administrative expense
     
Share-based compensation expenses      
Share-based compensation expense $ 6,620 $ 4,322 $ 4,657