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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments $ 5,753 $ 324
Long-term derivative instruments - asset 1,156 521
Short-term derivative instruments - liability 3,891 12,280
Long-term derivative instruments - liability $ 2,771 $ 11,366