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Supplemental Information On Oil And Gas Exploration And Production Activities (Changes In Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves) (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Supplemental Information On Oil And Gas Exploration And Production Activities [Abstract] | |||
| Sales and transfers of oil and gas produced, net of production costs | $ (181,723,000) | $ (96,056,000) | $ (59,463,000) |
| Net changes in prices, production costs, and development costs | 136,071,000 | 122,147,000 | 183,426,000 |
| Acquisition of oil and gas reserves in place | 72,000 | 63,043,000 | 20,981,000 |
| Extensions and discoveries | 107,110,000 | 88,227,000 | 32,638,000 |
| Revisions of previous quantity estimates, less related production costs | (112,553,000) | (89,155,000) | (77,531,000) |
| Sales of reserves in place | (13,185,000) | ||
| Accretion of discount | 31,549,000 | 24,077,000 | 12,624,000 |
| Net changes in income taxes | (36,674,000) | (54,879,000) | (22,238,000) |
| Change in production rates and other | 117,342,000 | 17,309,000 | 37,282,000 |
| Total change in standardized measure of discounted future net cash flows | $ 61,194,000 | $ 74,713,000 | $ 114,534,000 |
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- Definition
Change in production rates and other No definition available.
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- Definition
Net change in sales and transfer prices and in production (lifting) costs related to future production and in the evaluation of the costs that will be required in future periods to make it possible to extract or process proved oil and gas reserves. No definition available.
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- Definition
The increase in the net discounted value of the proved oil and gas reserves due only to the passage of time. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The change in the discounted value of the proved oil and gas reserves due to financial transactions where reserves (minerals in place) were sold. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This is the amount that proved oil and gas reserves increased due to extensions (increased estimates in the size of proven reserves), discoveries, additions, and improved recovery (increase in ability to extract oil and gas from existing reserves). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The increase (decrease) in the estimate of future income taxes that will be due on future pretax net cash flows relating to the enterprise's proved oil and gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The change in the discounted value of the proved oil and gas reserves due to financial transactions where new reserves were purchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Any changes made during the period to the evaluation or calculation of the estimated quantity of oil or gas in proved reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The amount of sales or transfers of oil gas that was previously included in proved oil and gas reserves. This amount is net of production costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The increase (decrease) as a result of changes in the elements used to estimate the discounted future net cash flow relating to proved oil and gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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