Supplemental Oil And Gas Disclosures (Results Of Operations For Producing Activities) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Oil and Gas Disclosures [Abstract]
Revenues	$ 314,925	$ 411,601	$ 347,285
Production costs	(116,051)	(113,810)	(107,332)
Depreciation, depletion, amortization, and impairment	(727,529)	(132,923)	(96,392)
Results of operations, income before income taxes	(528,655)	164,868	143,561
Income tax (expense) benefit	101,952	(42,915)	(56,376)
Results of operations for producing activities (excluding corporate overhead and financing costs)	$ (426,703)	$ 121,953	$ 87,185

Supplemental Oil and Gas Disclosures [Abstract]

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

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Income before income taxes for oil and gas producing activities.

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Income tax expense for oil and gas producing activities.

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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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Total revenues from oil and gas producing activities.

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