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Derivatives and Risk Management (Schedule of Derivatives) (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jul. 02, 2011
Jul. 03, 2010
Jul. 02, 2011
Jul. 03, 2010
Derivatives and Risk Management        
Cash flow hedging instruments $ (4,013) $ 2,866 $ (6,259) $ 3,178