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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenues-crude oil and natural gas sales | $ 67,176 | $ 84,521 | $ 104,943
Depreciation, depletion and amortization | 9,382 | 7,083 | 5,596
Gain on revision of asset retirement obligations |  | (379) | (3,325)
Impairment of proved crude oil and natural gas properties | 30,625 |  |
Bad debt (recovery) expense and other | 1,165 | (341) | (77)
Other operating expense, net | (1,669) | (4,421) | 365
Operating income (loss) | (27,263) | 21,193 | 51,287
Derivative instruments gain, net | 6,577 | (446) | 4,264
Interest income (expense), net | 155 | 733 | (145)
Other, net | 129 | (438) | 68
Income tax expense (benefit) | 27,681 | 23,890 | (43,254)
Additions to crude oil and natural gas properties and equipment - accrual | 10,494 | 22,173 | 38,634
Gabon Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues-crude oil and natural gas sales |  |  | 104,938
Depreciation, depletion and amortization |  |  | 5,176
Gain on revision of asset retirement obligations |  |  | (3,325)
Bad debt (recovery) expense and other |  |  | (77)
Other operating expense, net |  |  | 365
Operating income (loss) |  |  | 61,930
Interest income (expense), net |  |  | (396)
Other, net |  |  | 92
Income tax expense (benefit) |  |  | (26,670)
Additions to crude oil and natural gas properties and equipment - accrual |  |  | 38,430
Equatorial Guinea Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) |  |  | (470)
Other, net |  |  | (4)
Additions to crude oil and natural gas properties and equipment - accrual |  |  | 187
Operating Segments [Member] | Gabon Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues-crude oil and natural gas sales | 67,176 | 84,521 |
Depreciation, depletion and amortization | 9,028 | 6,825 |
Gain on revision of asset retirement obligations |  | (379) |
Impairment of proved crude oil and natural gas properties | 30,625 |  |
Bad debt (recovery) expense and other | 1,165 | (341) |
Other operating expense, net | (1,669) | (4,456) |
Operating income (loss) | (17,261) | 35,049 |
Interest income (expense), net |  | 5 |
Other, net | 194 | (230) |
Income tax expense (benefit) | 16,204 | 20,311 |
Additions to crude oil and natural gas properties and equipment - accrual | 10,503 | 22,116 |
Operating Segments [Member] | Equatorial Guinea Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (431) | (438) |
Other, net | 3 | (3) |
Income tax expense (benefit) | 1 | 12 |
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues-crude oil and natural gas sales |  |  | 5
Depreciation, depletion and amortization | 354 | 258 | 420
Other operating expense, net |  | 35 |
Operating income (loss) | (9,571) | (13,418) | (10,173)
Derivative instruments gain, net | 6,577 | (446) | 4,264
Interest income (expense), net | 155 | 728 | 251
Other, net | (68) | (205) | (20)
Income tax expense (benefit) | 11,476 | 3,567 | (16,584)
Additions to crude oil and natural gas properties and equipment - accrual | $ (9) | $ 57 | $ 17

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