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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - 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]        
Net income (loss) $ 8,749 $ (11,552) $ 17,122 $ (1,598)
Other comprehensive income, net of tax:        
Minimum pension liability adjustment, net of tax of $9, $2,152, $18 and $2,160 14 21,825 28 21,838
Recognition of unrealized loss on hedge transactions, net of tax of $(985), $(2,057), $(1,382) and $(5,054) (1,544) (3,221) (2,167) (7,914)
Other comprehensive (loss) income (1,530) 18,604 (2,139) 13,924
Total comprehensive income $ 7,219 $ 7,052 $ 14,983 $ 12,326