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Derivatives And Hedging (Summary Of Fair Value Interest Rate Contract Hedging Activity) (Details) (Interest Rate Contracts [Member], Fair Value Hedges [Member], Interest Expense, Net [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest Rate Contracts [Member] | Fair Value Hedges [Member] | Interest Expense, Net [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivative $ 1,004 $ 4,577 $ 3,065 $ 7,149
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 0 $ 0 $ 0 $ 0