Quarterly report pursuant to Section 13 or 15(d)

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

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Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 77,350 $ 78,391
Long-term derivative instruments - asset 25,871 24,448
Short-term derivative instruments - liability 937  
Long-term derivative instrument $ 2,753 $ 0