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Segment Information (Long-lived Assets from Continuing Operations) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 208,986 | $ 166,312
Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 56,617 | 52,724
Total assets | 208,986 | 163,022
Operating Segments | Gabon Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 46,276 | 42,195
Total assets | 148,221 | 103,401
Operating Segments | Equatorial Guinea Segment [Member] | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 10,000 | 10,187
Total assets | 10,085 | 10,320
Corporate and Other | Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Long lived assets | 341 | 342
Total assets | $ 50,680 | $ 49,301

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