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Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jul. 01, 2014
Jun. 30, 2015
Jul. 01, 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 $ 5,311 $ 3,778 $ 10,215 $ 7,399
Labor expense        
Share-based compensation expenses        
Share-based compensation expense 1,035 1,402 2,550 2,770
General and administrative expense        
Share-based compensation expenses        
Share-based compensation expense $ 4,276 $ 2,376 $ 7,665 $ 4,629