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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oil and natural gas properties, using full cost method of accounting      
Proved $ 1,484,359 $ 1,269,091 $ 1,056,806
Unproved 24,603 60,152 100,884
Total oil and natural gas properties 1,508,962 1,329,243 1,157,690
Less: accumulated depreciation, depletion and impairment (1,129,622) (580,132) (460,431)
Net oil and natural gas properties capitalized costs 379,340 749,111 $ 697,259
Property, Plant and Equipment, Net      
Total   226,182  
Financing Leases 2,109    
Total 222,804    
Less accumulated depreciation and amortization (34,201)    
Less accumulated depreciation and amortization   (25,344)  
Other property, plant and equipment, net 188,603    
Other property, plant and equipment, net   200,838  
Total property, plant and equipment, net 567,943 949,949  
Land      
Property, Plant and Equipment, Net      
Total 4,400 4,400  
Electrical infrastructure      
Property, Plant and Equipment, Net      
Total 126,482 131,176  
Non-oil and natural gas equipment      
Property, Plant and Equipment, Net      
Total 12,665 13,458  
Buildings and structures      
Property, Plant and Equipment, Net      
Total $ 77,148 $ 77,148