Supplemental Oil And Gas Disclosures (Schedule Of Capitalized Costs And Costs Incurred On Oil And Gas Properties) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Capitalized costs:
Proved properties	$ 6,341,582	$ 6,018,568	$ 5,712,813
Unproved properties not being amortized	252,874	330,216	296,764
Capitalized costs gross	6,594,456	6,348,784	6,009,577
Accumulated depreciation, depletion, amortization, and impairment	(5,846,177)	(5,124,257)	(4,996,696)
Net capitalized costs	748,279	1,224,527	1,012,881
Costs incurred:
Unproved properties acquired	34,668	57,430	47,029
Proved properties acquired	3,653	15,158	47,638
Exploration	16,480	15,907	14,811
Development	211,443	280,692	160,941
Asset retirement obligation	76	(7,629)	(3,613)
Total costs incurred	$ 266,320	$ 361,558	$ 266,806

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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