Non - productive oil wells number of wells gross

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- Definition

Net Leasehold Acres (Developed and Undeveloped)

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- Definition

Percentage of acre held for production

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- Definition

Percentage of proved developed reserves

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- Definition

Productive and non-productive oil wells number of wells gross

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- Definition

Proved Developed Reserves of NGL, Barrels

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- Definition

Proved developed reserves (volume) per day

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- Definition

Amount of the purchase price allocated to proved oil and gas properties acquired.

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The purchase price allocated to undeveloped oil and gas leasehold acquired.

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Undeveloped acreage is considered to be those lease acres on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such acreage contains proved reserves. Net acres is the sum of the fractional interest owned based on working interests or other economic arrangements.

+ References

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

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 5

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- Definition

The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 17

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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- Definition

The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest.

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-Publisher SEC

-Name Industry Guide

-Number 2

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- Definition

Production of proved reserves.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 59F

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities do not include reserves relating to interests of others in properties owned by the enterprise. Measured in barrel of oil equivalent (BOE).

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 19

-Paragraph 59E

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		1 Months Ended	0 Months Ended		1 Months Ended
	Jun. 30, 2010	Jun. 02, 2010 Boe A	Jun. 30, 2010 Southwest Oklahoma And North Texas [Member]	Jul. 20, 2011 Oklahoma And Lipscomb [Member]	Jul. 20, 2011 Oklahoma And Lipscomb [Member] Natural Gas Reserves [Member]	Aug. 31, 2011 Oklahoma Arkoma Woodford And Hartshorne Coal [Member] A	Aug. 31, 2011 Oklahoma Arkoma Woodford And Hartshorne Coal [Member] Natural Gas [Member]	Jun. 02, 2010 Oil Reserves [Member] bbl	Jun. 02, 2010 Natural Gas Liquids Reserves [Member]	Jun. 02, 2010 Natural Gas Reserves [Member] MMcf
Payments to acquire oil and gas property	$ 73.7		$ 17.6	$ 12.3		$ 30.5
Purchase price allocation for proved properties	48.7			8.4
Undeveloped leasehold	$ 25.0			$ 3.9
Gas and oil acreage, developed and undeveloped, net		45,000				55,000
Operating number of wells		10		30
Operating and non-operating number of wells						500
Non-operating number of wells				59
Proved developed reserves (BOE)		762,000
Proved developed reserves (volume)								511,000		573
Proved developed reserves (volume) per day, MMcfe					1.7
Proved developed reserves of NGL, barrels									155,000
Preliminary proved reserves, cubic feet					6,600,000,000		31,200,000,000
Percentage of proved developed reserves							83.00%
Net undeveloped acres			32,000	12,000
Percentage of acre held for production						96.00%