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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Oil and natural gas properties, using full cost method of accounting      
Proved $ 1,454,016 $ 1,463,950 $ 1,484,359
Unproved 12,255 17,964 24,603
Total oil and natural gas properties 1,466,271 1,481,914 1,508,962
Less: accumulated depreciation, depletion and impairment (1,373,217) (1,375,692) (1,129,622)
Net oil and natural gas properties capitalized costs 93,054 106,222 $ 379,340
Property, Plant and Equipment, Net      
Financing Leases 1,384 1,051  
Total 128,581 128,236  
Less accumulated depreciation and amortization (30,790) (25,118)  
Other property, plant and equipment, net 97,791 103,118  
Total property, plant and equipment, net 190,845 209,340  
Land      
Property, Plant and Equipment, Net      
Property, plant and equipment, gross 200 200  
Electrical infrastructure      
Property, Plant and Equipment, Net      
Property, plant and equipment, gross 121,819 121,819  
Non-oil and natural gas equipment      
Property, Plant and Equipment, Net      
Property, plant and equipment, gross 1,575 1,563  
Buildings and structures      
Property, Plant and Equipment, Net      
Property, plant and equipment, gross $ 3,603 $ 3,603