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Financial Instruments (Financial Instruments Activity Included As Part Of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands
Jun. 26, 2011
Dec. 31, 2010
Jun. 27, 2010
Dec. 31, 2009
Financial Instruments        
Balance at beginning of year $ (11,937) $ (15,262) $ (16,874) $ (17,343)
Additions and revaluations (294)   (3,897)  
Loss reclassified from AOCI into income 3,805   4,343  
Tax rate adjustment (186)   23  
Balance at end of period $ (11,937) $ (15,262) $ (16,874) $ (17,343)