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Oil and Gas Producing Activities - Capitalized Costs Related to Oil and Natural Gas Property Acquisition Exploration and Development Activities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Proved properties:
Leasehold costs	$ 3,010,760	$ 2,912,196
Wells and related equipment and facilities	1,636,428	1,165,317
Accumulated depreciation depletion and amortization	(901,003)	(485,851)
Proved properties	3,746,185	3,591,662
Unproved properties	332,765	410,897
Capitalized costs, oil and gas producing activities, net, total	$ 4,078,950	$ 4,002,559

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Capitalized costs lease hold costs.

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Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

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Net amount of capitalized costs relating to oil and gas producing activities.

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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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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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Capitalized costs which include those incurred to (1) to drill and equip those exploratory wells and exploratory-type stratigraphic test wells that have found proved reserves and (2) obtain access to proved reserves and provide facilities for extracting, treating, gathering, storing the oil and gas, including the drilling and equipping of development wells and development-type stratigraphic wells and service wells.

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