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Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2017
Jun. 28, 2016
Jun. 27, 2017
Jun. 28, 2016
Share-based compensation expenses        
Share-based compensation expense $ 6,147 $ 5,915 $ 12,365 $ 11,703
Labor expense        
Share-based compensation expenses        
Share-based compensation expense 1,739 1,507 3,433 2,906
General and administrative expense        
Share-based compensation expenses        
Share-based compensation expense $ 4,408 $ 4,408 $ 8,932 $ 8,797