Crude Oil and Natural Gas Properties and Equipment (Crude Oil and Natural Gas Properties and Equipment) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross crude oil and natural gas properties and equipment	$ 581,264	$ 549,484
Accumulated depreciation, depletion, amortization and impairment	(459,329)	(455,160)
Net crude oil and natural gas properties, equipment and other	121,935	94,324
Wells, Platforms and Other Production Facilities [Member]
Property, Plant and Equipment [Line Items]
Gross crude oil and natural gas properties and equipment	504,406	488,756
Work-in-Progress [Member]
Property, Plant and Equipment [Line Items]
Gross crude oil and natural gas properties and equipment	28,713	13,515
Undeveloped Acreage [Member]
Property, Plant and Equipment [Line Items]
Gross crude oil and natural gas properties and equipment	23,735	23,735
Equipment and Other [Member]
Property, Plant and Equipment [Line Items]
Gross crude oil and natural gas properties and equipment	$ 24,410	$ 23,478

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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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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