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Share-based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2016
Dec. 29, 2015
Dec. 30, 2014
Share-based compensation expenses      
Share-based compensation expense $ 26,067 $ 22,825 $ 14,883
Labor expense      
Share-based compensation expenses      
Share-based compensation expense 6,124 5,329 5,523
General and administrative expense      
Share-based compensation expenses      
Share-based compensation expense $ 19,943 $ 17,496 $ 9,360