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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Condensed Consolidated Statements Of Comprehensive Income (Unaudited) [Abstract]        
Tax on other comprehensive income $ 1,427 $ (247) $ 7,870 $ (701)