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Segment Information (Long-lived Assets From Continuing Operations) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 166,312 | $ 162,361 | $ 79,633
Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 52,724 |  | 23,221
Total assets | 163,022 |  | 76,797
Operating Segments | Continuing Operations [Member] | Gabon Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 42,195 |  | 12,638
Total assets | 103,401 |  | 63,121
Operating Segments | Continuing Operations [Member] | Equatorial Guinea Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 10,187 |  | 10,000
Total assets | 10,320 |  | 10,095
Corporate, Non-Segment | Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 342 |  | 583
Total assets | $ 49,301 |  | $ 3,581

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