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, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments $ 1,633 $ 664
Long-term derivative instruments - asset 127 0
Short-term derivative instruments - liabilities 4,808 10,442
Long-term derivative instruments - liability $ 962 $ 0