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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 808,000 $ 1,601,000
Short-term derivative instruments - liability 8,816,000  
Long-term derivative instruments - liability $ 1,523,000