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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Condensed Consolidated Statements Of Comprehensive Income (Unaudited) [Abstract]        
Tax on other comprehensive income $ (9,892) $ 2,351 $ (11,079) $ 6,443