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Share-based Compensation (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 25, 2012
Dec. 27, 2011
Dec. 28, 2010
Share-based Compensation      
Number of common shares that an RSU holder would receive upon satisfaction of service-based vesting requirement (in shares) 1    
Share-based compensation expenses      
Share-based compensation expense $ 13,193 $ 10,525 $ 7,686
Labor expense
     
Share-based compensation expenses      
Share-based compensation expense 4,570 3,905 3,364
General and administrative expense
     
Share-based compensation expenses      
Share-based compensation expense $ 8,623 $ 6,620 $ 4,322