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Commitments and Contingencies - Narrative (Details) $ in Millions		3 Months Ended	6 Months Ended
	May. 27, 2015 USD ($)	Jun. 30, 2015 USD ($) bcf claim $ / Mcf	Jun. 30, 2015 USD ($) bcf claim $ / Mcf	Dec. 31, 2014 USD ($) bcf $ / Mcf
James Hart And Other Named Plaintiffs
Commitments and Contingencies Disclosure
Litigation settlement, agreement in principle	$ 5.0
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
Settlement amount			$ 4.0
Shareholder Derivative Actions
Commitments and Contingencies Disclosure
Number of shareholder derivative actions claims filed | claim		7	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 per Mcf | $ / Mcf		0.25	0.25
Delivery made (in Bcf) | bcf				54.7
Delivery shortfall (in Bcf) | bcf				300.1
Cumulative shortfall accrued		$ 92.4	$ 92.4	$ 75.0
Final shortfall price per Mcf | $ / Mcf		0.70	0.70	0.70
Final shortfall, if not delivered in future periods		$ 103.9	$ 103.9	$ 210.1
Shortfall amount accrued		8.7	17.2
Annual minimum delivery requirement shortfall. 2012 to 2019, assuming no deliveries subsequent to balance sheet date		290.2	290.2
Delivery requirement reduction payment		290.5	290.5
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

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

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