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Accumulated Other Comprehensive Income (Loss) (Balance In Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 21, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Abstract]    
Derivatives designated as cash flow hedges $ (11,881) $ (14,908)
Pension and postretirement plans (96,282) (97,139)
Total $ (108,163) $ (112,047)