Derivative Activities (Details) (USD $)	Sep. 30, 2011 BblsPerDay
Collars [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	2,000
Average floor price	$ 70.00
Average cap price	80.00
Collars [Member] \| Natural Gas 2011 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	348,200
Average floor price	5.33
Average cap price	6.18
Collars [Member] \| Natural Gas 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	189,641
Average floor price	5.32
Average cap price	5.91
Collars [Member] \| Natural Gas 2013 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	160,000
Average floor price	5.09
Average cap price	5.65
Swap [Member] \| Natural Gas 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	70,000
Average hedge price	5.00
Swap [Member] \| NGL 2011 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	7,000
Average hedge price	104.17
Swap [Member] \| NGL 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	5,000
Average hedge price	102.59
Call Option [Member] \| Crude Oil 2011 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	5,500
Average price of oil call option (per barrel)	80.00
Call Option [Member] \| Crude Oil 2012 [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	4,700
Average price of oil call option (per barrel)	$ 85.00
Natural Gas [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	25,600,000
Average hedge price	5.00
NGL [Member]
Derivative volumes hedged and average hedge prices
Volume hedged	2,500,000
Average hedge price	103.00

Derivative Volumes Hedged And Average Hedge Prices.

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ Details

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ Details

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- Definition

The average strike price on the group of price risk option contracts such as put options or call options.

+ Details

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ Details

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- Definition

Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

+ Details

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