Supplemental Oil And Gas Disclosures (Schedule Of Capitalized Costs And Costs Incurred On Oil And Gas Properties) (Details) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
Dec. 31, 2020	Aug. 31, 2020	Dec. 31, 2019	Sep. 01, 2020
Capitalized costs:
Proved properties	$ 238,581	$ 6,539,816	$ 6,341,582	$ 238,284
Unproved properties not being amortized	1,591	30,205	252,874	$ 0
Capitalized costs gross	240,172		6,594,456
Accumulated depreciation, depletion, amortization, and impairment	(40,806)		(5,846,177)
Net capitalized costs	199,366		748,279
Costs incurred:
Unproved properties acquired	26	2,373	34,668
Proved properties acquired	0	382	3,653
Exploration	0	0	16,480
Development	3,992	6,440	211,443
Asset retirement obligation	(1,702)	(29,189)	76
Total costs incurred	$ 2,316	$ (19,994)	$ 266,320

Costs incurred in asset retirement obligation.

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

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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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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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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

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