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Commitments and Contingencies - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP
Commitments and Contingencies Disclosure
Damages sought by plaintiff	$ 45.5
General Land Office of the State of Texas
Commitments and Contingencies Disclosure
Damages sought by plaintiff	13.0
Patriot Exploration, LLC, Jonathan Feldman, Redwing Drilling Partners, Mapleleaf Drilling Partners, Avalanche Drilling Partners, Penguin Drilling Partners and Gramax Insurance Company Ltd.
Commitments and Contingencies Disclosure
Plaintiffs investment under participation agreement	16.0
Treating Agreement
Commitments and Contingencies Disclosure
Contract agreement, term	30 years
Minimum delivery required (in Bcf)	3,200
Estimated minimum delivery required remaining (in Bcf)	2,800
Initial shortfall price per Mcf	0.25
Shortfall price per Mcf, final year of agreement	0.70
Treating Agreement | Minimum
Commitments and Contingencies Disclosure
Range of projected shortfall in one year	30.0
Treating Agreement | Maximum
Commitments and Contingencies Disclosure
Range of projected shortfall in one year	$ 37.0

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Contract Term

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Estimated minimum delivery of CO2 volumes remaining under the terms of the treating agreement.

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Initial price per mcf of CO2 volumes below the minimum delivery requirement

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Minimum required delivery of CO2 volumes under the terms of the treating agreement.

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Plaintiffs investment under participation agreement as of the balance sheet date.

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Amounts projected to be payable within one year of the balance sheet date for CO2 shortfall volumes under terms of the treating agreement.

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Price per Mcf of CO2 volumes below minimum delivery requirement for the final year of the treating agreement.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

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-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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