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Consolidated Statements Of Comprehensive Income (Loss) Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 25, 2012
Statement of Other Comprehensive Income [Abstract]    
Amortization of pension plan actuarial losses, tax $ 108 $ 0
Change in realized and unrealized losses on derivative hedges, tax $ 0 $ (13)