Annual report pursuant to Section 13 and 15(d)

套期保值活动(现金流量套期保值表)(详情)

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套期保值活动(现金流量套期表)(详情)(美元)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Hedging Activities [Abstract]      
(减少)除油和凝析油销售 $ (4,720,000) $ (18,736,000) $ 5,313,000