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Significant Accounting Policies (Narrative) (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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| Natural gas imbalances | $ 6,500,000 | $ 6,500,000 | |
| Interest expense capitalized | (9,877,000) | (5,395,000) | (6,662,000) |
| Percentage of discount from proved reserves | 10.00% | ||
| Ceiling test impairment | $ 218,900,000 | ||
| Oil and natural gas proved reserve percentage | 15.00% | ||
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Furniture, Fixtures and Non-Oil and Natural Gas Property and Equipment [Member]
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| Estimated useful lives, minimum, years | 5 | ||
| Estimated useful lives, maximum, years | 7 | ||
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Leasehold Improvements [Member]
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| Estimated useful lives, description | Leasehold improvements are amortized over the shorter of their economic lives or the lease term. | ||
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Repairs and Maintenance Costs [Member]
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| Estimated useful lives, description | Repairs and maintenance costs are expensed in the period incurred. | ||
| X | ||||||||||
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- Definition
The value of gas balancing asset or liability as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of interest that was capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. No definition available.
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| X | ||||||||||
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- Definition
The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. No definition available.
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| X | ||||||||||
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- Definition
ceiling test impairment No definition available.
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| X | ||||||||||
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- Definition
Oil and natural gas proved reserve percentage No definition available.
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| X | ||||||||||
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- Definition
Percentage Of Discount From Proved Reserves No definition available.
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| X | ||||||||||
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- Definition
Property, Plant and Equipment, Useful Life, Description No definition available.
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