Fresh Start Accounting (Oil and Gas Properties Schedule) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 01, 2020	Aug. 31, 2020	Dec. 31, 2019
Proved properties	$ 238,581	$ 238,284	$ 6,539,816	$ 6,341,582
Unproved properties not being amortized	1,591	0	30,205	252,874
Property, plant and equipment, gross, total	600,989			8,931,355
Less accumulated depletion, amortization, and impairment	(54,189)			(6,978,669)
Net property and equipment	$ 546,800			$ 1,952,686
Oil and Natural Gas
Property, plant and equipment, gross, total		238,284	6,570,021
Less accumulated depletion, amortization, and impairment		0	(6,305,113)
Net property and equipment		$ 238,284	$ 264,908

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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 depreciation, depletion and amortization of physical assets used in the normal conduct of business 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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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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