Business Combination, Acres Acquired

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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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Unevaluated Costs Expected to be Evaluated Within Next Twelve Months

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of interest capitalized during the period.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1206
-Paragraph (a)

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Supplementary Information on Oil and Gas Operations—Unaudited - Investment in Oil and Gas Properties (Details) $ in Thousands, shares in Millions		1 Months Ended	12 Months Ended
	Dec. 20, 2017 USD ($) a	Dec. 31, 2017 USD ($) Wells shares	Dec. 31, 2017 USD ($) Wells	Dec. 31, 2016 USD ($) Wells	Dec. 31, 2015 USD ($)	Oct. 31, 2016 USD ($)	Jun. 04, 2015 USD ($)
Reserve Quantities [Line Items]
Sale of oil and gas properties			$ 10,707	$ 25,482	$ 271,769
Unevaluated oil and gas properties		$ 21,900	21,900	9,000
Interest costs capitalized			$ 1,600	900	4,700
Expected period to evaluate existing unevaluated properties			3 years
Unevaluated costs expected to be evaluated in 2017		4,100	$ 4,100
Fort Trinidad
Reserve Quantities [Line Items]
Sale of oil and gas properties					500
East Haynesville
Reserve Quantities [Line Items]
Sale of oil and gas properties					100
Uncompleted Wells Equipment and Facilities
Reserve Quantities [Line Items]
Unevaluated oil and gas properties		$ 700	$ 700	$ 400
Exploratory wells drilled, unevaluated \| Wells		2	2	1
Incurred In 2017
Reserve Quantities [Line Items]
Unevaluated oil and gas properties		$ 14,600	$ 14,600
Percentage of unevaluated costs capitalized in period		67.00%	67.00%
Incurred In 2016
Reserve Quantities [Line Items]
Unevaluated oil and gas properties				$ 2,000
Percentage of unevaluated costs capitalized in period				9.00%
Incurred Prior 2016
Reserve Quantities [Line Items]
Unevaluated oil and gas properties					$ 5,200
Percentage of unevaluated costs capitalized in period					24.00%
Austin Chalk Acreage
Reserve Quantities [Line Items]
Acres acquired \| a	24,600
Purchase price	$ 9,300
Common shares issued in connection with acquisition \| shares		2.0
Woodford And Mississippian Lime
Reserve Quantities [Line Items]
Sale of oil and gas properties			$ 274,100
Consideration received from sale							$ 280,000
Oklahoma Assets
Reserve Quantities [Line Items]
Sale of oil and gas properties				$ 17,600
Consideration received from sale						$ 700
Gulf of Mexico Properties
Reserve Quantities [Line Items]
Unevaluated oil and gas properties		$ 5,500	$ 5,500
Percentage of unevaluated costs capitalized in period		25.00%	25.00%