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Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Other Comprehensive Items:        
Pension and other post-retirement liability adjustments, tax effect $ (6) $ 12 $ 14 $ 22
Deferred gain (loss) on cash flow hedges, tax effect $ (19) $ 47 $ 103 $ 190