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Interest Rate Contracts (Schedule Of Fair Values Of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative asset, fair value $ 1 $ 4
Derivative liability, fair value 93,280 100,294
Derivatives designated as accounting hedges
   
Derivative [Line Items]    
Derivative asset, fair value 0 0
Derivative liability, fair value 93,280 100,294
Derivatives not designated as accounting hedges
   
Derivative [Line Items]    
Derivative asset, fair value 1 4
Derivative liability, fair value 0 0
Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Derivative asset, fair value 1 4
Derivative liability, fair value $ 93,280 $ 100,294