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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, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | $ 472,800 | $ 464,957
Accumulated depreciation, depletion, amortization and impairment | (435,764) | (396,699)
Net crude oil and natural gas properties, equipment and other | 37,036 | 68,258
Wells, Platforms and Other Production Facilities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | 441,879 | 422,651
Work-in-Progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | 169 | 7,378
Undeveloped Acreage [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | 21,476 | 23,771
Equipment and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Gross crude oil and natural gas properties and equipment | $ 9,276 | $ 11,157

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