Annual report pursuant to Section 13 and 15(d)

Hedging Activities (Schedule Of Cash Flow Hedges) (Details)

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Hedging Activities (Schedule Of Cash Flow Hedges) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Hedging Activities [Abstract]      
(Reduction) addition to oil and condensate sales $ (4,720,000) $ (18,736,000) $ 5,313,000