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Derivative Instruments (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments $ 142,794 $ 78,391
Long-term derivative instruments - asset 51,088 24,448
Short-term derivative instruments - liability 437 0
Long-term derivative instruments - liability $ 6,935 $ 0