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Segment Information (Long-lived Assets from Continuing Operations) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 141,232 | $ 211,537
Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 37,036 | 68,258
Total assets | 141,232 | 211,537
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 26,832 | 57,930
Total assets | 101,399 | 151,686
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 10,000 | 10,000
Total assets | 10,267 | 10,087
Corporate and Other [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 204 | 328
Total assets | $ 29,566 | $ 49,764

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