根据第13和15(d)条提交的年度报告

套期保值活动 (Schedule Of Cash Flow Hedges) (Details)

v2.4.0.6
套期保值活动 (Schedule Of Cash Flow Hedges) (Details) (USD $)
12个月结束
12月. 31, 2011
12月. 31, 2010
12月. 31, 2009
套期保值活动[摘要]      
(Reduction) addition to oil and condensate sales $ (4,720,000) $ (18,736,000) $ 5,313,000