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Condensed Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 24, 2019
Sep. 25, 2018
Sep. 24, 2019
Sep. 25, 2018
Consolidated Statements of Income and Comprehensive Income        
Foreign currency translation adjustment, (tax)/benefit $ 40 $ 54 $ 35 $ 46