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Share-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Apr. 01, 2014
Mar. 26, 2013
Share-based Compensation    
Number of common shares that an RSU holder would receive upon satisfaction of the vesting requirement (in shares) 1  
Share-based compensation expenses    
Share-based compensation expense $ 3,621 $ 3,512
Labor expense
   
Share-based compensation expenses    
Share-based compensation expense 1,368 1,330
General and administrative expense
   
Share-based compensation expenses    
Share-based compensation expense $ 2,253 $ 2,182