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Area Of Land With Option To Acquire From Lease

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Asset Acquisition, Percentage Of Working Interest Acquired

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Asset Acquisition, Percentage Of Working Interest Previously Owned

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Disposal Group, Including Discontinued Operation, Ownership Interest In Asset Prior To Disposal

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Drilling Commitment, Number Of Wells

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Drilling Commitment, Option, Number Of Acres

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Number Of Leases Acquired

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Number Of Wells Committed To Drilling Under Acquired Lease Option

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Oil And Gas Delivery Commitments And Contracts, Consecutive Period Tolled If Fixed Price Not Met

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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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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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The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The delivery price committed to in the contract.

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The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale.

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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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Amount of cash inflow for the sale of long-lived, physical assets used to produce goods and services and not intended for resale, classified as other.

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Energy measure of oil and natural gas production reserves.

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Acquisitions and Divestitures (Details)			1 Months Ended		3 Months Ended		7 Months Ended	9 Months Ended	10 Months Ended
Acquisitions and Divestitures (Details)	Oct. 17, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2018	Apr. 30, 2018 USD ($) a lease well $ / bbl	Sep. 30, 2018 USD ($) MBoe	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of properties and equipment and other							$ 234,823,000	$ 3,377,000	$ 234,292,000
Gains on sale of assets and other, net					$ (400,000)	$ 20,692,000	20,687,000	(522,000)	22,930,000
Daily production (Mboe) \| MBoe					0.7
Percentage of working interest in investment acquired		84.00%
Percentage of working interest in investment previously owned										16.00%
Payments to acquire property		$ 249,000,000					$ 259,444,000	$ 0	$ 249,338,000
Hugoton Natural Gas Field
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Working interest divested			78.00%
Proceeds from sale of properties and equipment and other		234,000,000
Gains on sale of assets and other, net		$ 23,000,000
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of non-core oil and gas properties	$ 7,000,000
Chevron North Midway-Sunset Acquisition
Business Acquisition [Line Items]
Number of leases acquired \| lease				2
Area of land acquired in lease (in acres) \| a				214
Area of land with option to acquire from lease (in acres) \| a				490
Drilling commitment assumed				$ 34,500,000
Drilling commitment, number of wells \| well				115
Number of wells committed to drilling under lease option \| well				40
Drilling commitment, number of acres \| a				490
Consideration transferred in acquisition				$ 0
Oil and gas delivery commitments, consecutive period for which price not met which will incur a toll				30 days
Oil and gas delivery commitments, fixed price to be met, less than (in dollars per barrel) \| $ / bbl				45