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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Parenthetical] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Statement of Comprehensive Income [Abstract]        
Foreign currency translation, tax $ (2,689) $ (551) $ 1,880 $ (1,633)
Unrealized gain (loss) on hedging activities, tax 252 (6,249) 3,352 (14,872)
Amortization of pension and other post-retirement net actuarial loss, tax 165 722 641 2,658
Amortization of pension and other post-retirement prior service cost, tax $ 0 $ 24 $ 0 $ 71