Annual report pursuant to Section 13 and 15(d)

Income Taxes (Income Tax Years Subject To Examination By Major Tax Jurisdictions) (Details)

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Income Taxes (Income Tax Years Subject To Examination By Major Tax Jurisdictions) (Details)
12 Months Ended
Dec. 31, 2021
United States [Member]  
Income Tax Examination [Line Items]  
Income tax examination year under examination 2012
United States [Member] | Maximum [Member]  
Income Tax Examination [Line Items]  
Income tax examination year under examination 2021
Gabon [Member] | Minimum [Member]  
Income Tax Examination [Line Items]  
Income tax examination year under examination 2017
Gabon [Member] | Maximum [Member]  
Income Tax Examination [Line Items]  
Income tax examination year under examination 2021