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 $)
Mar. 31, 2012
Hedging Activities [Abstract]  
Short-term derivative instruments - liability $ 9,259,000
Long-term derivative instruments - liability $ 127,000