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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Parenthetical] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jun. 30, 2017
Jul. 01, 2016
Statement of Comprehensive Income [Abstract]        
Foreign currency translation, tax $ 1,013 $ 2,190 $ (1,082) $ 2,436
Unrealized loss on hedging activities, tax (8,859) 1,181 (8,623) (1,699)
Amortization of pension and other post-retirement net actuarial loss, tax 1,176 775 1,936 1,450
Amortization of pension and other post-retirement prior service cost, tax $ 23 $ 26 $ 47 $ 48