Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.19.3
Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Income Taxes [Line Items]      
Effective income tax rate 101.00% 101.00%  
Deferred tax assets, basis difference in fixed assets     $ 46,500,000
Deferred tax liabilities, basis difference in fixed assets     9,800,000
Statutory tax rate   21.00%  
Uncertain tax positions   $ 0  
Change in valuation allowance $ 4,800,000    
Restatement Adjustment [Member]      
Income Taxes [Line Items]      
Valuation allowance     $ 29,900,000
Authorities Other Than United States And Gabon [Member]      
Income Taxes [Line Items]      
Effective income tax rate   0.00%