Business Combination, Acres Acquired In Leasehold Position

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Business Combination, Unevaluated Acres Acquired

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Disposal Group, Percent of Assets Sold

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Oil and Gas Producing Activities, Expected Period to Evaluate Existing Unevaluated Properties

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Percentage of Unevaluated Costs Capitalized in Period

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Proved Developed and Undeveloped Reserves, Increases (Decreases)

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Unevaluated Costs Expected to be Evaluated Within Next Twelve Months

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

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The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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-Topic 932

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-Section S99

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-Subparagraph (SX 210.4-10.(c)(7)(ii))

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Amount of interest capitalized during the period.

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-Glossary Allowance for Funds Used during Construction

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Name Accounting Standards Codification

-Glossary Investing Activities

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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-Name Accounting Standards Codification

-Glossary Investing Activities

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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The number of wells in the process of being drilled in each geographic area as of the date listed.

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-Publisher SEC

-Name Industry Guide

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Supplementary Information on Oil and Gas Operations—Unaudited - Investment in Oil and Gas Properties - Unaudited (Textuals) (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 MBbls	Dec. 31, 2012 MBbls	Jul. 03, 2013 acre	Jun. 30, 2014 acre
Reserve Quantities [Line Items]
Sale of oil and gas properties	$ 8,610,000	$ 19,913,000	$ 837,000
Unevaluated oil and gas properties	109,100,000	98,400,000
Interest costs capitalized	10,000,000us-gaap_InterestCostsCapitalized	6,600,000us-gaap_InterestCostsCapitalized	7,000,000us-gaap_InterestCostsCapitalized
Oil and Gas Producing Activities, Expected Period to Evaluate Existing Unevaluated Properties	3 years
Unevaluated costs expected to be evaluated in 2013	32,500,000
Proved undeveloped reserve		5,088,000us-gaap_ProvedUndevelopedReserveVolume	5,817,000us-gaap_ProvedUndevelopedReserveVolume
Mississippian Lime
Reserve Quantities [Line Items]
Sale of oil and gas properties			6,100,000
Eagle Ford
Reserve Quantities [Line Items]
Sale of oil and gas properties	9,800,000
Woodford
Reserve Quantities [Line Items]
Sale of oil and gas properties		10,400,000
Percent of saltwater disposal systems and related surface assets sold		50.00%
Wyoming
Reserve Quantities [Line Items]
Sale of oil and gas properties		1,000,000
Arkansas
Reserve Quantities [Line Items]
Sale of oil and gas properties			8,500,000
Uncompleted Wells Equipment and Facilities
Reserve Quantities [Line Items]
Unevaluated oil and gas properties	16,800,000	11,300,000
Exploratory wells drilled, unevaluated	16	19
2012
Reserve Quantities [Line Items]
Unevaluated oil and gas properties	56,300,000
Percentage of unevaluated costs capitalized in period	52.00%
2011
Reserve Quantities [Line Items]
Unevaluated oil and gas properties		21,100,000
Percentage of unevaluated costs capitalized in period		19.00%
Prior to 2011
Reserve Quantities [Line Items]
Unevaluated oil and gas properties			31,700,000
Percentage of unevaluated costs capitalized in period			29.00%
Gulf of Mexico Acquisition
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, increases (decreases)		35,000,000
Unevaluated acres acquired				13,500
10% Senior Notes \| Gulf of Mexico Acquisition
Reserve Quantities [Line Items]
Purchase price				188,800,000
Louisiana \| Fleetwood Joint Venture
Reserve Quantities [Line Items]
Aggregate purchase price					24,000,000
Number of acres acquired					30,000
Purchase price					$ 10,000,000