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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Oil and natural gas properties    
Proved $ 1,479,664 $ 1,484,359
Unproved 18,653 24,603
Total oil and natural gas properties 1,498,317 1,508,962
Less: accumulated depreciation, depletion and impairment (1,367,703) (1,129,622)
Net oil and natural gas properties 130,614 379,340
Property, Plant and Equipment, net    
Financing leases 1,298 2,109
Total 128,572 222,804
Less accumulated depreciation and amortization (23,747) (34,201)
Other property, plant and equipment, net 104,825 188,603
Total property, plant and equipment, net 235,439 567,943
Land    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 200 4,400
Electrical infrastructure    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 121,818 126,482
Other non-oil and natural gas equipment    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 1,653 12,665
Buildings and structures    
Property, Plant and Equipment, net    
Property, plant and equipment, gross $ 3,603 $ 77,148