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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-oil and natural gas sales | $ 27,606 | $ 25,266 | $ 24,426 | $ 27,645 | $ 17,156 | $ 18,178 | $ 20,425 | $ 21,266 | $ 104,943 | $ 77,025 | $ 59,784
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 5,596 | 6,457 | 6,926
Impairment of proved properties |  |  |  |  |  |  |  |  |  |  | 88
Bad debt expense and other |  |  |  |  |  |  |  |  | (77) | 452 | 1,222
Operating income (loss) | $ 15,206 | $ 17,320 | $ 5,723 | $ 13,038 | $ 2,495 | $ 3,721 | $ 5,587 | $ 8,148 | 51,287 | 19,951 | (4,391)
Other, net |  |  |  |  |  |  |  |  | 4,332 | 2,113 | (2,015)
Interest expense, net |  |  |  |  |  |  |  |  | (145) | (1,414) | (2,613)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (43,254) | 10,378 | 9,248
Additions to oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | 38,634 | 1,702 | (4,061)
Operating Segments | Gabon Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-oil and natural gas sales |  |  |  |  |  |  |  |  | 104,938 | 76,978 | 59,460
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 5,176 | 6,196 | 6,531
Bad debt expense and other |  |  |  |  |  |  |  |  | (77) | 452 | 1,222
Operating income (loss) |  |  |  |  |  |  |  |  | 61,930 | 28,488 | 3,901
Other, net |  |  |  |  |  |  |  |  | 92 | 3,142 | (22)
Interest expense, net |  |  |  |  |  |  |  |  | (396) | (1,414) | (2,614)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (26,670) | 11,638 | 9,248
Additions to oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | 38,430 | 1,576 | (4,242)
Operating Segments | Equatorial Guinea Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (470) | (122) | (384)
Other, net |  |  |  |  |  |  |  |  | (4) | 15 | (8)
Additions to oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | 187 |  |
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues-oil and natural gas sales |  |  |  |  |  |  |  |  | 5 | 47 | 324
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 420 | 261 | 395
Impairment of proved properties |  |  |  |  |  |  |  |  |  |  | 88
Operating income (loss) |  |  |  |  |  |  |  |  | (10,173) | (8,415) | (7,908)
Other, net |  |  |  |  |  |  |  |  | 4,244 | (1,044) | (1,985)
Interest expense, net |  |  |  |  |  |  |  |  | 251 |  | 1
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (16,584) | (1,260) |
Additions to oil and natural gas properties and equipment - accrual |  |  |  |  |  |  |  |  | $ 17 | $ 126 | $ 181

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