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Derivative Instruments (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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General Discussion of Derivative Instruments and Hedging Activities [Abstract] |  |
Short-term derivative instruments - asset | $ 44,672 | $ 142,794
Long-term derivative instruments - asset | 14,644 | 51,088
Short-term derivative instruments - liability | 49,906 | 437
Long-term derivative instruments - liability | $ 29,269 | $ 6,935

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