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Condensed Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Other Comprehensive Items:    
Pension and other post-retirement liability adjustments, tax effect $ 34 $ 49
Deferred gain on cash flow hedges, tax effect $ 8 $ 15