Income Taxes (Income Tax Years Subject To Examination By Major Tax Jurisdictions) (Details) |
12 Months Ended |
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Dec. 31, 2018 | |
| United States | Minimum | |
| Income Tax Examination [Line Items] | |
| Income tax examination year under examination | 2009 |
| United States | Maximum | |
| Income Tax Examination [Line Items] | |
| Income tax examination year under examination | 2018 |
| Gabon | Minimum | |
| Income Tax Examination [Line Items] | |
| Income tax examination year under examination | 2014 |
| Gabon | Maximum | |
| Income Tax Examination [Line Items] | |
| Income tax examination year under examination | 2018 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Tax year being audited in the income tax examination, in CCYY format. No definition available.
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