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Derivative Instruments (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 152,211 $ 142,794
Long-term derivative instruments - asset 42,455 51,088
Short-term derivative instruments 5,715 437
Short-term derivative instruments 51,908 50,697
Long-term derivative instruments - liability $ 10,127 $ 6,935