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Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Other Comprehensive Items:    
Pension and other post-retirement liability adjustments, tax effect $ 8 $ 34
Deferred benefit (provision) on cash flow hedges, tax effect $ 104  
Deferred benefit (provision) on cash flow hedges, tax effect   $ (8)