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Share-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 24, 2013
Sep. 30, 2014
Sep. 24, 2013
Share-based Compensation        
Number of common shares that an RSU holder would receive upon satisfaction of the vesting requirement (in shares) 1   1  
Share-based compensation expenses        
Share-based compensation expense $ 3,538 $ 3,612 $ 10,937 $ 10,583
Labor expense
       
Share-based compensation expenses        
Share-based compensation expense 1,282 1,356 4,052 4,027
General and administrative exp
       
Share-based compensation expenses        
Share-based compensation expense $ 2,256 $ 2,256 $ 6,885 $ 6,556