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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