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Derivative Financial Instruments (Fair Value Of Derivative Instruments Included In Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Interest Rate Swap Contracts $ 22,137 $ 19,091
Designated as Hedging Instrument [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest Rate Swap Contracts 13,398 19,091
Not Designated As Hedging Instrument [Member] | Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Interest Rate Swap Contracts $ 8,739 $ 0