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Supplemental Information On Oil And Gas Exploration And Production Activities (Narrative) (Details) (USD $)
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12个月结束 | |||||
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12月. 31, 2014
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12月. 31, 2013
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12月. 31, 2012
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12月. 31, 2011
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12月. 31, 2010
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12月. 31, 2009
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| Supplemental Information On Oil And Gas Exploration And Production Activities [Abstract] | ||||||
| 每桶价格 | $ 96.19 | $ 76.16 | $ 57.90 | |||
| 每百万英热单位价格 | 4.12 | 4.38 | 3.87 | |||
| Future development costs estimated to be spent in 2012 | 52,855,000 | |||||
| Future development costs estimated to be spent in 2013 | 49,897,000 | |||||
| Future development costs estimated to be spent in 2014 | $ 55,364,000 | |||||