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Commitments and Contingencies - Narrative (Details) $ in Millions			3 Months Ended	9 Months Ended
	Oct. 07, 2015 USD ($)	Apr. 05, 2011 USD ($)	Sep. 30, 2015 USD ($) bcf $ / Mcf	Sep. 30, 2015 USD ($) bcf $ / Mcf	Dec. 31, 2014 USD ($) bcf $ / Mcf	Mar. 31, 2013 claim
James Hart And Other Named Plaintiffs
Commitments and Contingencies Disclosure
Litigation reserve established			$ 5.1	$ 5.1
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
Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Number of shareholder derivative actions claims filed | claim						7
Treating Agreement
Commitments and Contingencies Disclosure
Contract agreement, term				30 years
Minimum delivery required (in Bcf) | bcf			3,200	3,200
Initial shortfall price (usd per Mcf) | $ / Mcf			0.25	0.25
Delivery made (in Bcf) | bcf					54.7
Delivery shortfall (in Bcf) | bcf					300.1
Cumulative shortfall accrued			$ 101.0	$ 101.0	$ 75.0
Final shortfall price (usd per Mcf) | $ / Mcf			0.70	0.70	0.70
Final shortfall, if not delivered in future periods			$ 100.7	$ 100.7	$ 210.1
Shortfall amount accrued			8.8	26.0
Annual minimum delivery requirement shortfall. 2012 to 2019, assuming no deliveries subsequent to balance sheet date			289.1	289.1
Delivery requirement reduction payment			290.1	290.1
Treating Agreement | Minimum
Commitments and Contingencies Disclosure
Projected shortfall amount			31.0	31.0
Treating Agreement | Maximum
Commitments and Contingencies Disclosure
Projected shortfall amount			$ 38.0	$ 38.0
Pending Litigation | Subsequent Event | Federal Shareholder Derivative Litigation And Others
Commitments and Contingencies Disclosure
Escrow fund amount established	$ 38.0

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Cumulative Shortfall Accrued

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Cumulative deliveries of CO2 volumes as of the balance sheet date

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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.

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Cumulative underdeliveries of CO2 volumes as of the balance sheet date

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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.

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Escrow Fund Amount Established Related To Litigation Settlement

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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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Based upon actual deliveries as of the balance sheet date, payment that would be required for minimum annual CO2 volume requirements under the agreement for 2012 through 2019, assuming no future CO2 volume deliveries after 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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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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