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Derivative Instruments And Hedging Activities (Summary Of Fair Value Of Derivative Instruments) (Details) (Interest Rate Swap Contracts [Member], Other Liabilities [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Swap Contracts [Member] | Other Liabilities [Member]
   
Derivative [Line Items]    
Derivatives designated as hedging instruments under GAAP, Fair Value $ 635 $ 580