Quarterly report pursuant to Section 13 or 15(d)

Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details)

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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 93,030us-gaap_DerivativeAssetsCurrent $ 78,391us-gaap_DerivativeAssetsCurrent
Long-term derivative instruments - asset 41,956us-gaap_DerivativeInstrumentsAndHedgesNoncurrent 24,448us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Short-term derivative instruments - liability $ 823us-gaap_DerivativeLiabilitiesCurrent