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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
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

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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