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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Information [Abstract] |
Segment Activity | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31, 2018
﻿(in thousands) |  | Gabon |  | Equatorial Guinea |  | Corporate and Other |  | Total
﻿Revenues-oil and natural gas sales |  | $ | 104,938 |  | $ | — |  | $ | 5 |  | $ | 104,943
﻿Depreciation, depletion and amortization |  |  | 5,176 |  |  | — |  |  | 420 |  |  | 5,596
﻿Bad debt expense and other |  |  | (77) |  |  | — |  |  | — |  |  | (77)
﻿Operating income (loss) |  |  | 61,930 |  |  | (470) |  |  | (10,173) |  |  | 51,287
﻿Other, net |  |  | 92 |  |  | (4) |  |  | 4,244 |  |  | 4,332
﻿Interest expense, net |  |  | (396) |  |  | — |  |  | 251 |  |  | (145)
﻿Income tax benefit |  |  | (26,670) |  |  | — |  |  | (16,584) |  |  | (43,254)
﻿Additions to oil and natural gas properties and equipment - accrual |  |  | 38,430 |  |  | 187 |  |  | 17 |  |  | 38,634
﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31, 2017
﻿(in thousands) |  | Gabon |  | Equatorial Guinea |  | Corporate and Other |  | Total
﻿Revenues-oil and natural gas sales |  | $ | 76,978 |  | $ | — |  | $ | 47 |  | $ | 77,025
﻿Depreciation, depletion and amortization |  |  | 6,196 |  |  | — |  |  | 261 |  |  | 6,457
﻿Bad debt expense and other |  |  | 452 |  |  | — |  |  | — |  |  | 452
﻿Operating income (loss) |  |  | 28,488 |  |  | (122) |  |  | (8,415) |  |  | 19,951
﻿Other, net |  |  | 3,142 |  |  | 15 |  |  | (1,044) |  |  | 2,113
﻿Interest expense, net |  |  | (1,414) |  |  | — |  |  | — |  |  | (1,414)
﻿Income tax expense (benefit) |  |  | 11,638 |  |  | — |  |  | (1,260) |  |  | 10,378
﻿Additions to oil and natural gas properties and equipment - accrual |  |  | 1,576 |  |  | — |  |  | 126 |  |  | 1,702
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31, 2016
﻿(in thousands) |  | Gabon |  | Equatorial Guinea |  | Corporate and Other |  | Total
﻿Revenues-oil and natural gas sales |  | $ | 59,460 |  | $ | — |  | $ | 324 |  | $ | 59,784
﻿Depreciation, depletion and amortization |  |  | 6,531 |  |  | — |  |  | 395 |  |  | 6,926
﻿Impairment of proved properties |  |  | — |  |  | — |  |  | 88 |  |  | 88
﻿Bad debt expense and other |  |  | 1,222 |  |  | — |  |  | — |  |  | 1,222
﻿Operating income (loss) |  |  | 3,901 |  |  | (384) |  |  | (7,908) |  |  | (4,391)
﻿Other, net |  |  | (22) |  |  | (8) |  |  | (1,985) |  |  | (2,015)
﻿Interest expense, net |  |  | (2,614) |  |  | — |  |  | 1 |  |  | (2,613)
﻿Income tax expense |  |  | 9,248 |  |  | — |  |  | — |  |  | 9,248
﻿Additions to oil and natural gas properties and equipment - accrual |  |  | (4,242) |  |  | — |  |  | 181 |  |  | (4,061)
﻿
Long-lived Assets From Continuing Operations |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | Gabon |  | Equatorial Guinea |  | Corporate and Other |  | Total
﻿Long-lived assets from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |
﻿As of December 31, 2018 |  | $ | 42,195 |  | $ | 10,187 |  | $ | 342 |  | $ | 52,724
﻿As of December 31, 2017 |  |  | 12,638 |  |  | 10,000 |  |  | 583 |  |  | 23,221
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | Gabon |  | Equatorial Guinea |  | Corporate and Other |  | Total
﻿Total assets from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |
﻿As of December 31, 2018 |  | $ | 103,401 |  | $ | 10,320 |  | $ | 49,301 |  | $ | 163,022
﻿As of December 31, 2017 |  |  | 63,121 |  |  | 10,095 |  |  | 3,581 |  |  | 76,797
﻿

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