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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues-oil and natural gas sales | $ 25,266 | $ 18,178 | $ 77,337 | $ 59,869
Operating income (loss) | 17,320 | 3,721 | 36,081 | 17,456
Other, net | (1,029) | (793) | (2,184) | (571)
Income tax expense (benefit) | (62,224) | 2,749 | (54,600) | 9,039
Additions to properties and equipment - accrual | 17,986 | 297 | 18,955 | 1,111
Operating Segments [Member] | Gabon Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues-oil and natural gas sales | 25,265 | 18,162 | 77,333 | 59,823
Operating income (loss) | 19,826 | 6,067 | 45,670 | 25,117
Other, net | 3 | 142 | (127) | 441
Income tax expense (benefit) | (42,141) | 2,749 | (34,517) | 9,039
Additions to properties and equipment - accrual | 17,983 | 237 | 18,938 | 1,051
Operating Segments [Member] | Equatorial Guinea Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (159) | (44) | (274) | (97)
Other, net |  | 4 | (3) | 13
Corporate And Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues-oil and natural gas sales | 1 | 16 | 4 | 46
Operating income (loss) | (2,347) | (2,302) | (9,315) | (7,564)
Other, net | (1,032) | (939) | (2,054) | (1,025)
Income tax expense (benefit) | (20,083) |  | (20,083) |
Additions to properties and equipment - accrual | $ 3 | $ 60 | $ 17 | $ 60

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