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Segment Information (Segment Activity) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Revenues-crude oil and natural gas sales | $ 47,023,000 | $ 17,974,000 | $ 86,797,000 | $ 36,363,000
Depreciation, depletion and amortization | 5,810,000 | 2,801,000 | 9,958,000 | 5,904,000
Impairment of proved crude oil and natural gas properties | 0 | 0 | 0 | 30,625,000
Bad debt expense and other | 395,000 | 179,000 | 496,000 | 989,000
Other operating expense, net | (126,000) | (815,000) | (486,000) | (846,000)
Operating income (loss) | 18,874,000 | (966,000) | 33,217,000 | (27,649,000)
Derivative instruments gain (loss), net | (9,969,000) | (756,000) | (15,923,000) | 6,583,000
Other, net | (164,000) | 47,000 | 4,416,000 | 16,000
Income tax expense (benefit) | 2,825,000 | (2,249,000) | 5,911,000 | 31,229,000
Additions to crude oil and natural gas properties and equipment - accrual | 1,782,000 | 1,190,000 | 4,297,000 | 10,611,000
Operating Segments [Member] | Gabon Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues-crude oil and natural gas sales | 47,023,000 | 17,974,000 | 86,797,000 | 36,363,000
Depreciation, depletion and amortization | 5,786,000 | 2,772,000 | 9,907,000 | 5,844,000
Impairment of proved crude oil and natural gas properties |  |  |  | 30,625,000
Bad debt expense and other |  |  |  | 989,000
Other operating expense, net |  | (815,000) |  | (846,000)
Operating income (loss) | 23,419,000 | 1,704,000 | 42,099,000 | (24,579,000)
Other, net |  |  | 7,525,000 |
Income tax expense (benefit) | 2,721,000 | (273,000) | 7,960,000 | 21,766,000
Additions to crude oil and natural gas properties and equipment - accrual | 1,782,000 | 1,190,000 | 4,297,000 | 10,611,000
Operating Segments [Member] | Equatorial Guinea Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (102,000) | (69,000) | (234,000) | (194,000)
Other, net |  |  | (1,000) |
Income tax expense (benefit) |  |  | 1,000 |
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation, depletion and amortization | 24,000 | 29,000 | 51,000 | 60,000
Operating income (loss) | (4,443,000) | (2,601,000) | (8,648,000) | (2,876,000)
Derivative instruments gain (loss), net | (9,969,000) | (756,000) | (15,923,000) | 6,583,000
Other, net |  |  | (3,108,000) |
Income tax expense (benefit) | $ 104,000 | $ (1,976,000) | $ (2,050,000) | $ 9,463,000

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