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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2017
Jun. 29, 2016
Jun. 28, 2017
Jun. 29, 2016
Statement of Comprehensive Income [Abstract]        
Minimum pension liability adjustment, tax $ 9 $ 2,152 $ 18 $ 2,160
Unrealized loss on hedge transactions, tax $ (985) $ (2,057) $ (1,382) $ (5,054)