Quarterly report pursuant to Section 13 or 15(d)

Crude Oil and Natural Gas Properties and Equipment (Crude Oil and Natural Gas Properties and Equipment) (Details)

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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