Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.21.2
Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Taxes [Line Items]        
Effective income tax rate     37.50% (53.00%)
Change in valuation allowance, discrete item $ 22,300,000   $ 22,300,000  
Change in valuation allowance     (15,800,000)  
Current tax expense 5,516,000 $ 2,393,000 15,099,000 $ 1,876,000
Favorable oil price adjustment 200,000   1,700,000  
Current tax expense, net of favorable oil price adjustment $ 5,300,000   13,400,000  
Uncertain tax positions     $ 0  
Authorities Other Than United States And Gabon [Member]        
Income Taxes [Line Items]        
Effective income tax rate     0.00%