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Condensed Consolidated Statement 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
Other Comprehensive Items:        
Pension and other post-retirement liability adjustments, tax effect $ 26 $ 68 $ 86 $ (91)
Deferred gain (loss) on hedging instruments, tax effect $ 28 $ 75 $ 44 $ (148)