The approximate aggregate purchase price per the acquisition agreement.

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Area of land held.

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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 assets acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

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- Definition

The number of real estate properties owned as of the balance sheet date.

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No definition available.

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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
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- Definition

Energy measure of oil and natural gas production reserves.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
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-Section 1204
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Acquisitions and divestitures - 2016 acquisitions of evaluated and unevaluated oil and natural gas properties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) a Boe property
Business Acquisition [Line Items]
Cash consideration	$ 17,538	$ 0	$ 124,660
Leasehold Interests Acquired In Western Glasscock And Reagan Counties
Business Acquisition [Line Items]
Area of land (in acres) \| a			9,200
Number of real estate properties \| property			81
Production, barrels of oil equivalents \| Boe			300
Sale price			$ 124,700
Total assets acquired			125,828
Asset retirement obligations			(1,105)
Net assets acquired			124,723
Cash consideration			124,723
Evaluated oil and natural gas properties \| Leasehold Interests Acquired In Western Glasscock And Reagan Counties
Business Acquisition [Line Items]
Fair value of net assets:			4,800
Unevaluated oil and natural gas properties \| Leasehold Interests Acquired In Western Glasscock And Reagan Counties
Business Acquisition [Line Items]
Fair value of net assets:			119,923
Asset retirement cost \| Leasehold Interests Acquired In Western Glasscock And Reagan Counties
Business Acquisition [Line Items]
Fair value of net assets:			$ 1,105