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Crude Oil and Natural Gas Properties and Equipment (Crude Oil and Natural Gas Properties and Equipment) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | $ 549,484 | $ 472,800
Accumulated depreciation, depletion, amortization and impairment | (455,160) | (435,764)
Net crude oil and natural gas properties, equipment and other | 94,324 | 37,036
Wells, Platforms and Other Production Facilities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | 488,756 | 441,879
Work-in-Progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | 13,515 | 169
Undeveloped Acreage [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | 23,735 | 21,476
Equipment and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | $ 23,478 | $ 9,276

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