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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Revenues-oil and natural gas sales | $ 59,784 | $ 80,445 | $ 127,691
Depreciation, depletion and amortization | 6,926 | 32,998 | 20,074
Impairment of proved properties | 88 | 81,322 | 98,341
Bad debt expense and other | 1,222 | 2,968 | 2,400
Operating income (loss) | (4,391) | (103,106) | (50,605)
Interest income (expense), net | (2,613) | (1,325) | 75
Income tax expense | 9,248 | 14,587 | 22,486
Additions to properties and equipment | (4,061) | 66,419 | 83,994
Total assets | 81,032 | 123,958 |
Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 28,019 | 33,357 |
Total assets | 78,893 | 115,573 |
Operating Segments [Member] | Gabon [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues-oil and natural gas sales | 59,460 | 79,947 | 126,322
Depreciation, depletion and amortization | 6,531 | 32,125 | 19,079
Impairment of proved properties |  | 78,080 | 98,341
Bad debt expense and other | 1,222 | 2,968 | 2,400
Operating income (loss) | 3,901 | (87,243) | (42,105)
Interest income (expense), net | (2,614) | (1,144) | 42
Income tax expense | 9,248 | 13,238 | 22,486
Additions to properties and equipment | (4,242) | 66,269 | 83,170
Operating Segments [Member] | Gabon [Member] | Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 17,291 | 21,329 |
Total assets | 64,478 | 98,858 |
Operating Segments [Member] | Equatorial Guinea [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (384) | (1,342) | (1,525)
Operating Segments [Member] | Equatorial Guinea [Member] | Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 10,000 | 10,000 |
Total assets | 10,122 | 10,200 |
Operating Segments [Member] | United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues-oil and natural gas sales | 324 | 498 | 1,369
Depreciation, depletion and amortization | 151 | 633 | 901
Impairment of proved properties | 88 | 3,242 |
Operating income (loss) | (72) | (4,366) | (119)
Additions to properties and equipment |  |  | 8
Operating Segments [Member] | United States [Member] | Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets |  | 1,234 |
Total assets | 382 | 1,470 |
Corporate And Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, depletion and amortization | 244 | 240 | 94
Operating income (loss) | (7,836) | (10,155) | (6,856)
Interest income (expense), net | 1 | (181) | 33
Income tax expense |  | 1,349 |
Additions to properties and equipment | 181 | 150 | $ 816
Corporate And Other [Member] | Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long lived assets | 728 | 794 |
Total assets | $ 3,911 | $ 5,045 |

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