Agreements expiration date.

No definition available.

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- Definition

Contract Term

+ References

No definition available.

+ Details

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- Definition

Cumulative Shortfall Accrued

+ References

No definition available.

+ Details

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- Definition

Cumulative deliveries of CO2 volumes as of the balance sheet date

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, payment that would be required to reduce future minimum annual CO2 volume requirements under the agreement to zero assuming no future CO2 volume deliveries.

+ References

No definition available.

+ Details

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- Definition

Cumulative underdeliveries of CO2 volumes as of the balance sheet date

+ References

No definition available.

+ Details

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- Definition

The date by which development under a development agreement is to occur, Term, Latest

+ References

No definition available.

+ Details

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- Definition

Shortfall that will be payable in the final year of the agreement if cumulative underdeliveries of CO2 volumes as of the balance sheet date are not made up in the future.

+ References

No definition available.

+ Details

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- Definition

Estimated cost to fulfill drilling obligations as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

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

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-Section 50

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

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Commitments and Contingencies - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]
Total rental expense under operating leases	$ 3,600,000us-gaap_OperatingLeasesRentExpenseNet	$ 2,600,000us-gaap_OperatingLeasesRentExpenseNet	$ 1,500,000us-gaap_OperatingLeasesRentExpenseNet
Permian Trust
Commitments and Contingencies Disclosure [Line Items]
Development period deadline under development agreement latest date	Mar. 31, 2016
Mississippian Trust II
Commitments and Contingencies Disclosure [Line Items]
Development period deadline under development agreement latest date	Dec. 31, 2016
Permian Trust and Mississippian Trust II
Commitments and Contingencies Disclosure [Line Items]
Estimated remaining drilling obligation	137,000,000
Gas Gathering Agreement \| Pinon Gathering Company LLC
Commitments and Contingencies Disclosure [Line Items]
Agreement expiration date	Jun. 30, 2029
Treating Agreement
Commitments and Contingencies Disclosure [Line Items]
Contract agreement, term	30 years
Minimum delivery required (in Bcf)	3,200
Initial shortfall price per Mcf	0.25
Delivery made (in Bcf)	34.0
Delivery shortfall (in Bcf)	164.4
Cumulative shortfall accrued	41,100,000
Final shortfall price per Mcf	0.7
Treating Agreement \| Minimum
Commitments and Contingencies Disclosure [Line Items]
Range of projected shortfall in one year	30,000,000
Treating Agreement \| Maximum
Commitments and Contingencies Disclosure [Line Items]
Final shortfall, if not delivered in future periods	115,100,000
Delivery requirement reduction payment	591,100,000
Range of projected shortfall in one year	37,000,000
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 [Line Items]
Plaintiffs investment under participation agreement	16,000,000
General Land Office of the State of Texas
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages sought, value	13,000,000
Wesley West Minerals, Ltd and Longfellow Ranch Partners, LP
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages sought, value	45,500,000
Rig Commitments
Commitments and Contingencies Disclosure [Line Items]
Minimum future commitments, 2014	20,300,000
Minimum future commitments, 2015	$ 1,100,000