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Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2015
Sep. 30, 2014
Sep. 29, 2015
Sep. 30, 2014
Share-based compensation expenses        
Number of common shares that an RSU holder would receive upon satisfaction of the vesting requirement (in shares) 1   1  
Share-based compensation expense $ 5,434 $ 3,538 $ 15,649 $ 10,937
Labor expense        
Share-based compensation expenses        
Share-based compensation expense 1,387 1,282 3,937 4,052
General and administrative expense        
Share-based compensation expenses        
Share-based compensation expense $ 4,047 $ 2,256 $ 11,712 $ 6,885