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Consolidated Statements Of Comprehensive Loss Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 24, 2012
Jun. 30, 2013
Jun. 24, 2012
Statement of Other Comprehensive Income [Abstract]        
Amortization of pension plan actuarial losses, tax $ 113 $ 0 $ 221 $ 0
Change in realized and unrealized losses on derivative hedges, tax $ 0 $ 18 $ 0 $ 5