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Segment Information (Long-lived Assets From Continuing Operations) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 177,137 | $ 141,232
Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 78,192 | 37,036
Total assets | 177,137 | 141,232
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 68,016 | 26,832
Total assets | 154,130 | 101,399
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 10,000 | 10,000
Total assets | 10,426 | 10,267
Corporate and Other [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 176 | 204
Total assets | $ 12,581 | $ 29,566

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