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Derivative Instruments And Hedging Activities (Schedule Of Notional Values And Fair Values Of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments And Hedging Activities [Abstract]    
Notional Value $ 386,212 $ 550,127
Liability derivatives, Negative fair value $ (9,349) $ (19,934)