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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

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount as of the balance sheet date of the assets arising from derivative contracts and hedging activities, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

+ References

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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