Supplemental Oil and Natural Gas Disclosures - Oil and Natural Gas Capitalized Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Proved properties	$ 2,228,893	$ 2,377,305
Unproved properties	1,073,447	1,063,883
Total	3,302,340	3,441,188
Accumulated depreciation, depletion, amortization, and impairment	(1,870,412)	(1,865,692)
Oil and natural gas properties, net	$ 1,431,928	$ 1,575,496

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

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The sum of capitalized costs relating to oil and gas producing activities before accounting for accumulated depreciation.

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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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