Increase (Decrease) in Estimated Proved Reserves, Percent

No definition available.

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- Definition

Proved Developed and Undeveloped Reserves, Company Drilling Success Rate

+ References

No definition available.

+ Details

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- Definition

Proved Developed and Undeveloped Reserves, Gross Wells Drilled

+ References

No definition available.

+ Details

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- Definition

Proved Developed and Undeveloped Reserves, Increases (Decreases)

+ References

No definition available.

+ Details

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- Definition

The average consolidated production costs (lifting costs) per unit of production. Costs may include costs incurred to operate and maintain wells and equipment and to pay production taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 3

-Subparagraph A

+ Details

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Oil and Gas Reserve Information - Unaudited - Average price and text (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reserve Quantities [Line Items]
Decrease in proved developed and undeveloped reserves	14.00%
Company drilling success rate	98.00%
Gross wells drilled	107
Oil [Member]
Reserve Quantities [Line Items]
Consolidated oil and gas production costs per unit of production	102.81	101.42	79.72
Natural Gas Liquids [Member]
Reserve Quantities [Line Items]
Consolidated oil and gas production costs per unit of production	6.07	8.62	7.00
Natural Gas [Member]
Reserve Quantities [Line Items]
Consolidated oil and gas production costs per unit of production	2.20	3.34	3.56
OKLAHOMA
Reserve Quantities [Line Items]
Additions to proved reserves		27,000
La Cantera [Member]
Reserve Quantities [Line Items]
Additions to proved reserves		9,000
Carthage Field in the Cotton Valley [Member]
Reserve Quantities [Line Items]
Additions to proved reserves		28,000