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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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General Discussion of Derivative Instruments and Hedging Activities [Abstract] |  |
Short-term derivative instruments | $ 78,391 us-gaap_DerivativeAssetsCurrent | $ 324 us-gaap_DerivativeAssetsCurrent
Long-term derivative instruments - asset | 24,448 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent | 521 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Short-term derivative instruments - liabilities | 0 us-gaap_DerivativeLiabilitiesCurrent | 12,280 us-gaap_DerivativeLiabilitiesCurrent
Long-term derivative instruments - liability | $ 0 us-gaap_DerivativeLiabilitiesNoncurrent | $ 11,366 us-gaap_DerivativeLiabilitiesNoncurrent

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