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Share-based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2017
Dec. 27, 2016
Dec. 29, 2015
Share-based compensation expenses      
Share-based compensation expense $ 26,934 $ 26,067 $ 22,825
Labor expense      
Share-based compensation expenses      
Share-based compensation expense 7,171 6,124 5,329
General and administrative expense      
Share-based compensation expenses      
Share-based compensation expense $ 19,763 $ 19,943 $ 17,496