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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2016
Sep. 30, 2015
Sep. 28, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Minimum pension liability adjustment, tax $ 8 $ 169 $ 2,168 $ 507
Unrealized gain (loss) on hedged transactions, tax $ 20 $ (2,266) $ (5,034) $ (1,303)