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Derivatives And Hedging (Interest Rate Contracts Reported At Their Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Other Assets, Net [Member]
   
Derivatives And Hedging [Line Items]    
Interest rate contract designated as hedge, assets $ 10,281 $ 10,816
Other Liabilities, Net [Member]
   
Derivatives And Hedging [Line Items]    
Interest rate contract designated as hedge, liabilities $ 652 $ 674