Asset Retirement Obligation, Liabilities Related To Oil And Gas Properties Sold

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Business Combination, Acres Acquired

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- Definition

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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- Definition

Unevaluated Costs Expected to be Evaluated Within Next Twelve Months

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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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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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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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- Definition

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

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

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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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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
	Jan. 31, 2018 USD ($)	Dec. 20, 2017 USD ($) a	Jan. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) Wells	Dec. 31, 2016 USD ($)	Dec. 15, 2017 USD ($)	Apr. 17, 2017 USD ($)
Reserve Quantities [Line Items]
Decrease in asset retirement obligation liabilities related to divestiture of oil and gas properties				$ 28,234	$ 248
Sale of oil and gas properties				(6,478)	10,707	$ 25,482
Unevaluated oil and gas properties				23,500	21,900
Interest costs capitalized				$ 1,800	1,600	900
Expected period to evaluate existing unevaluated properties				3 years
Unevaluated costs expected to be evaluated in 2017				$ 2,700
Uncompleted Wells Equipment and Facilities
Reserve Quantities [Line Items]
Unevaluated oil and gas properties				900	$ 700
Exploratory wells drilled, unevaluated \| Wells					2
Incurred In 2017
Reserve Quantities [Line Items]
Unevaluated oil and gas properties				$ 7,400
Percentage of unevaluated costs capitalized in period				32.00%
Incurred In 2016
Reserve Quantities [Line Items]
Unevaluated oil and gas properties					$ 13,900
Percentage of unevaluated costs capitalized in period					59.00%
Incurred Prior 2016
Reserve Quantities [Line Items]
Unevaluated oil and gas properties						$ 2,200
Percentage of unevaluated costs capitalized in period						9.00%
Austin Chalk Acreage
Reserve Quantities [Line Items]
Acres acquired \| a		24,600
Purchase price		$ 9,300		$ 15,000
Common shares issued in connection with acquisition \| shares				2.0
Oklahoma Assets
Reserve Quantities [Line Items]
Consideration received from sale						$ 17,600
Gulf of Mexico Properties
Reserve Quantities [Line Items]
Decrease in asset retirement obligation liabilities related to divestiture of oil and gas properties			$ 28,200
Unevaluated oil and gas properties				$ 5,500
Percentage of unevaluated costs capitalized in period				25.00%
Interests in East Lake Verret Field
Reserve Quantities [Line Items]
Consideration received from sale								$ 2,200
Saltwater Disposal Assets in East Texas
Reserve Quantities [Line Items]
Consideration received from sale							$ 8,500
Pro Forma \| Gulf of Mexico Properties
Reserve Quantities [Line Items]
Decrease in asset retirement obligation liabilities related to divestiture of oil and gas properties	$ 28,200