Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

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- Definition

Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets.

+ References

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10A, 10B

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 4, 17

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-Publisher FASB

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-Topic 815

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-Topic 825

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- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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- Definition

The price per unit of the notional amount of the derivative contract expressed in nonmonetary units. For example, the price per barrel specified in a fuel oil forward purchase contract.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Derivative Instruments (Details) (USD $)	12 Months Ended
Derivative Instruments (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Commodity price derivative instruments	Dec. 31, 2012 Commodity price derivative instruments West Texas Intermediate crude oil Jan 2013-Dec 2013 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Jan 2013-Dec 2013, two Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Jan 2013-Jun 2013 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Jan 2013-Dec 2013, three Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Jan 2013-Mar 2013 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Apr 2013-Jun 2013 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Jul 2013-Sep 2013 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Oct 2012-Dec 2012 Swap Not Designated MBbls	Feb. 08, 2013 Commodity price derivative instruments Brent crude oil Jan 2014-Dec 2014 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Brent crude oil Jan 2014-Dec 2014 Swap Not Designated MBbls	Feb. 08, 2013 Commodity price derivative instruments Brent crude oil Jan 2014 - Jun 2014 Swap Not Designated MBbls	Dec. 31, 2012 Commodity price derivative instruments Henry Hub NYMEX natural gas Jan 2013-Dec 2013 Collar Not Designated MMBTU	Dec. 31, 2012 Commodity price derivative instruments Henry Hub NYMEX natural gas Jan 2013-Dec 2013, two Collar Not Designated MMBTU	Dec. 31, 2012 Commodity price derivative instruments Henry Hub NYMEX natural gas Jan 2013-Jun 2013 Collar Not Designated MMBTU	Dec. 31, 2012 Commodity price derivative instruments Henry Hub NYMEX natural gas Jan 2013-Dec 2013, three Collar Not Designated MMBTU	Dec. 31, 2012 Commodity price derivative instruments Henry Hub NYMEX natural gas Jan 2013-Dec 2014, one Collar Not Designated MMBTU	Dec. 31, 2012 Commodity price derivative instruments Henry Hub NYMEX natural gas Jan 2013-Dec 2014, two Collar Not Designated MMBTU
DERIVATIVE INSTRUMENTS
Net assets for derivative instruments	$ 2,000,000	$ 4,200,000
Unrealized (loss) gain on derivative instruments	(2,288,189)	454,906	(6,500,825)
Volume/Month (in Bbls or Mmbtu)					14	9	6	6	11	7	6	3	6	7.5	2	75,000	75,000	50,000	35,000	42,500	42,500
Price/Unit (in dollars per Bbls or per Mmbtu)					101.25	109.13	108.35	107.10	106.90	104.80	103.47	102.30	106.40	102.10	108.07
Floor Price/Unit (in dollars per Bbls or per Mmbtu)																3.00	3.25	3.75	3.75	3.75	3.50
Cap Price/Unit (in dollars per Bbls or per Mmbtu)																4.25	4.00	4.00	4.21	4.60	5.00
Fair value of derivative asset					1,346,343	232,424		9,047						9,304			124	113,637	131,550	217,794	146,480
Fair value of derivative liability							(9,626)		(87,050)	(60,153)	(45,781)	(21,320)				(22,768)
Total net fair value of derivative assets				$ 1,960,005