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Share-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 28, 2011
Jun. 29, 2010
Jun. 28, 2011
Jun. 29, 2010
Share-based Compensation.        
Number of common shares that an RSU holder would receive upon satisfaction of vesting requirement (in shares) 1   1  
Share-based compensation expenses        
Share-based compensation expense $ 2,773 $ 1,906 $ 5,733 $ 3,736
Labor expense
       
Share-based compensation expenses        
Share-based compensation expense 996 842 1,934 1,603
General and administrative expense [member]
       
Share-based compensation expenses        
Share-based compensation expense $ 1,777 $ 1,064 $ 3,799 $ 2,133