Quarterly report pursuant to Section 13 or 15(d)

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

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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