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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
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments $ 78,391us-gaap_DerivativeAssetsCurrent $ 324us-gaap_DerivativeAssetsCurrent
Long-term derivative instruments - asset 24,448us-gaap_DerivativeInstrumentsAndHedgesNoncurrent 521us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Short-term derivative instruments - liabilities 0us-gaap_DerivativeLiabilitiesCurrent 12,280us-gaap_DerivativeLiabilitiesCurrent
Long-term derivative instruments - liability $ 0us-gaap_DerivativeLiabilitiesNoncurrent $ 11,366us-gaap_DerivativeLiabilitiesNoncurrent