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Derivative Instruments (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 39,363 $ 142,794
Long-term derivative instruments - asset 15,262 51,088
Short-term derivative instruments - liability 37,220 437
Long-term derivative instruments - liability $ 14,907 $ 6,935