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Segment Information (Long-lived Assets From Continuing Operations) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 308,510 | $ 263,090
Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 121,935 | 94,324
Total assets | 308,510 | 263,090
Operating Segments [Member] | Gabon Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 111,787 | 84,156
Total assets | 235,229 | 201,748
Operating Segments [Member] | Equatorial Guinea Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 10,000 | 10,000
Total assets | 10,871 | 10,548
Corporate and Other [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 148 | 168
Total assets | $ 62,410 | $ 50,794

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