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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Revenues-oil and natural gas sales | $ 19,765 | $ 27,645
Depreciation, depletion and amortization | 1,553 | 1,124
Recorded allowance | (29) | (56)
Operating income (loss) | 5,546 | 13,038
Derivative instruments loss, net | (1,912) |
Other, net | (238) | 69
Interest income | 187 | (354)
Income tax expense | 2,753 | 4,042
Additions to oil and natural gas properties and equipment - accrual | 685 | 427
Operating Segments | Gabon Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues-oil and natural gas sales | 19,765 | 27,643
Depreciation, depletion and amortization | 1,479 | 1,059
Recorded allowance | (29) | (56)
Operating income (loss) | 9,530 | 15,697
Other, net | (172) | 69
Interest income | 1 | (354)
Income tax expense | 2,491 | 4,042
Additions to oil and natural gas properties and equipment - accrual | 681 | 428
Operating Segments | Equatorial Guinea Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating income (loss) | (186) | (30)
Other, net | (2) | 3
Income tax expense | 10 |
Additions to oil and natural gas properties and equipment - accrual | (187) |
Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Revenues-oil and natural gas sales |  | 2
Depreciation, depletion and amortization | 74 | 65
Operating income (loss) | (3,798) | (2,629)
Derivative instruments loss, net | (1,912) |
Other, net | (64) | (3)
Interest income | 186 |
Income tax expense | 252 |
Additions to oil and natural gas properties and equipment - accrual | $ 191 | $ (1)

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