OIL AND NATURAL GAS INTERESTS (Details) $ in Thousands	Sep. 30, 2020 USD ($) a	Dec. 31, 2019 USD ($) a
Oil and natural gas interests:
Subject to depletion	$ 1,478,621	$ 1,316,692
Not subject to depletion	1,452,248	1,551,767
Gross oil and natural gas interests	2,930,869	2,868,459
Accumulated depletion and impairment	(398,678)	(326,474)
Oil and natural gas interests, net	2,532,191	2,541,985
Land	5,688	5,688
Property, net	$ 2,537,879	$ 2,547,673
Mineral properties, net royalty acres \| a	24,696	24,304

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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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Depletion of oil and gas property carried under the full cost method.

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Oil and gas properties, gross, carried under the full cost method.

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Oil and gas properties, net of depletion, carried under the full cost method.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The amount of net royalty acres. Net royalty acres are defined as gross acreage multiplied by the average royalty interest.

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