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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Parenthetical] - USD ($)
$ in Thousands
3 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Statement of Comprehensive Income [Abstract]    
Foreign currency translation, tax $ (365) $ (843)
Unrealized gain on hedging activities, tax 1,878 2,933
Amortization of pension and other post-retirement net actuarial loss, tax (1,926) 203
Amortization of pension and other post-retirement prior service cost, tax $ 0 $ 0