Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.20.1
Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Taxes [Line Items]    
Effective income tax rate (68.00%) 77.00%
Uncertain tax positions $ 0  
Change In Crude Oils Prices [Member]    
Income Taxes [Line Items]    
Change in valuation allowance 23,100,000  
Difference Between Cost Account and Book Basis of Oil and Gas Property [Member]    
Income Taxes [Line Items]    
Change in valuation allowance (12,300,000)  
Basis Differences In Fixed Assets And Net Operating Loss Carryforwards [Member]    
Income Taxes [Line Items]    
Change in valuation allowance $ (11,500,000)  
Authorities Other Than United States And Gabon [Member]    
Income Taxes [Line Items]    
Effective income tax rate 0.00%