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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Revenues-crude oil and natural gas sales | $ 18,389 | $ 19,765
Depreciation, depletion and amortization | 3,103 | 1,553
Impairment of proved crude oil and natural gas properties | 30,625 |
Bad debt recovery and other | 810 | (29)
Operating income (loss) | (26,683) | 5,546
Derivative instruments gain (loss), net | 7,339 | (1,912)
Income tax expense | 33,478 | 2,753
Additions to crude oil and natural gas properties and equipment - accrual | 9,421 | 685
Operating Segments [Member] | Gabon Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues-crude oil and natural gas sales | 18,389 | 19,765
Depreciation, depletion and amortization | 3,072 | 1,479
Impairment of proved crude oil and natural gas properties | 30,625 |
Bad debt recovery and other | 810 | (29)
Operating income (loss) | (26,283) | 9,530
Income tax expense | 22,039 | 2,491
Additions to crude oil and natural gas properties and equipment - accrual | 9,421 | 681
Operating Segments [Member] | Equatorial Guinea Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating income (loss) | (125) | (186)
Income tax expense |  | 10
Additions to crude oil and natural gas properties and equipment - accrual |  | (187)
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation, depletion and amortization | 31 | 74
Operating income (loss) | (275) | (3,798)
Derivative instruments gain (loss), net | 7,339 | (1,912)
Income tax expense | $ 11,439 | 252
Additions to crude oil and natural gas properties and equipment - accrual |  | $ 191

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