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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
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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

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