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Subsequent Events (Details) (Subsequent Event [Member], Swap [Member], Natural Gas [Member])	Oct. 31, 2013
Natural Gas Fixed Price Swap, January 2014 Through April 2016 [Member]
Derivative [Line Items]
Notional quantity	30,000
Average fixed price	4.11
Natual Gas Fixed Price Swap, January 2015 Through April 2016 [Member]
Derivative [Line Items]
Notional quantity	40,000
Average fixed price	4.15

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: 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=7476318&loc=SL5579245-113959



Reference 2: 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=7476318&loc=SL5580258-113959

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- Definition

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

+ References

No definition available.

+ Details

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