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v3.20.1

Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-crude oil and natural gas sales | $ 21,923 | $ 17,603 | $ 25,230 | $ 19,765 | $ 27,606 | $ 25,266 | $ 24,426 | $ 27,645 | $ 84,521 | $ 104,943 | $ 77,025
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 7,083 | 5,596 | 6,457
Bad debt (recovery) expense and other |  |  |  |  |  |  |  |  | (341) | (77) | 452
Gain on revision of asset retirement obligations |  |  |  |  |  |  |  |  | (379) | (3,325) |
Other operating income (expense), net |  |  |  |  |  |  |  |  | (4,421) | 365 | (84)
Operating income (loss) | $ 7,776 | $ 1,501 | $ 6,370 | $ 5,546 | $ 15,206 | $ 17,320 | $ 5,723 | $ 13,038 | 21,193 | 51,287 | 19,951
Derivative instruments loss, net |  |  |  |  |  |  |  |  | (446) | 4,264 | (1,032)
Interest income (expense), net |  |  |  |  |  |  |  |  | 733 | (145) | (1,414)
Other, net |  |  |  |  |  |  |  |  | (438) | 68 | 3,145
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 23,890 | (43,254) | 10,378
Additions to crude oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | 22,173 | 38,634 | 1,702
Gabon Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-crude oil and natural gas sales |  |  |  |  |  |  |  |  |  |  | 76,978
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 6,196
Bad debt (recovery) expense and other |  |  |  |  |  |  |  |  |  |  | 452
Other operating income (expense), net |  |  |  |  |  |  |  |  |  |  | (84)
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 28,488
Interest income (expense), net |  |  |  |  |  |  |  |  |  |  | (1,414)
Other, net |  |  |  |  |  |  |  |  |  |  | 3,142
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 11,638
Additions to crude oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  |  |  | 1,576
Equatorial Guinea Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (122)
Other, net |  |  |  |  |  |  |  |  |  |  | 15
Operating Segments [Member] | Gabon Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-crude oil and natural gas sales |  |  |  |  |  |  |  |  | 84,521 | 104,938 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 6,825 | 5,176 |
Bad debt (recovery) expense and other |  |  |  |  |  |  |  |  | (341) | (77) |
Gain on revision of asset retirement obligations |  |  |  |  |  |  |  |  | (379) | (3,325) |
Other operating income (expense), net |  |  |  |  |  |  |  |  | (4,456) | 365 |
Operating income (loss) |  |  |  |  |  |  |  |  | 35,049 | 61,930 |
Interest income (expense), net |  |  |  |  |  |  |  |  | 5 | (396) |
Other, net |  |  |  |  |  |  |  |  | (230) | 92 |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 20,311 | (26,670) |
Additions to crude oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | 22,116 | 38,430 |
Operating Segments [Member] | Equatorial Guinea Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (438) | (470) |
Other, net |  |  |  |  |  |  |  |  | (3) | (4) |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 12 |  |
Additions to crude oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  |  | 187 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-crude oil and natural gas sales |  |  |  |  |  |  |  |  |  | 5 | 47
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 258 | 420 | 261
Other operating income (expense), net |  |  |  |  |  |  |  |  | 35 |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (13,418) | (10,173) | (8,415)
Derivative instruments loss, net |  |  |  |  |  |  |  |  | (446) | 4,264 | (1,032)
Interest income (expense), net |  |  |  |  |  |  |  |  | 728 | 251 |
Other, net |  |  |  |  |  |  |  |  | (205) | (20) | (12)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 3,567 | (16,584) | (1,260)
Additions to crude oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | $ 57 | $ 17 | $ 126

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