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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 116,100 $ 78,391
Long-term derivative instruments - asset 51,171 24,448
Short-term derivative instruments - liability 2,351  
Long-term derivative instruments - liability $ 3,208 $ 0