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Schedule I - Parent Company Financial Statement (Statements Of Condensed Unconsolidated Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | $ 6,457 | $ 6,926 | $ 32,998
General and administrative expense |  |  |  |  |  |  |  |  | 10,377 | 9,561 | 12,294
Shareholder matters |  |  |  |  |  |  |  |  |  | (332) | 2,372
Total operating costs and expenses | $ 14,413 | $ 14,454 | $ 15,068 | $ 13,055 | $ 14,249 | $ 10,919 | $ 14,232 | $ 24,509 | 56,990 | 63,909 | 182,459
Operating income (loss) | 2,495 | 3,721 | 5,587 | 8,148 | 819 | 3,690 | 4,615 | (13,515) | 19,951 | (4,391) | (103,106)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | 2,113 | (2,015) | (1,536)
Total other income (expense) |  |  |  |  |  |  |  |  | 699 | (4,628) | (2,861)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 20,650 | (9,019) | (105,967)
Income taxes (benefit) expense |  |  |  |  |  |  |  |  | 10,378 | 9,248 | 14,587
Net income (loss) | $ 3,431 | $ (322) | $ 2,283 | $ 4,259 | $ (3,641) | $ (14,767) | $ (518) | $ (7,624) | 9,651 | (26,550) | (158,656)
VAALCO ENERGY, INC. [Member] |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 260 | 244 | 240
General and administrative expense |  |  |  |  |  |  |  |  | 8,489 | 7,935 | 7,550
Shareholder matters |  |  |  |  |  |  |  |  |  | (332) | 2,372
Total operating costs and expenses |  |  |  |  |  |  |  |  | 8,749 | 7,847 | 10,162
Other operating income, net |  |  |  |  |  |  |  |  | (12) | 16 |
Operating income (loss) |  |  |  |  |  |  |  |  | (8,761) | (7,831) | (10,162)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest exense, net |  |  |  |  |  |  |  |  |  | (2) | (181)
Other, net |  |  |  |  |  |  |  |  | (1,044) | (1,985) | (469)
Equity in subsidiary earnings (losses) |  |  |  |  |  |  |  |  | 18,196 | (16,732) | (146,495)
Total other income (expense) |  |  |  |  |  |  |  |  | 17,152 | (18,719) | (147,145)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 8,391 | (26,550) | (157,307)
Income taxes (benefit) expense |  |  |  |  |  |  |  |  | (1,260) |  | 1,349
Net income (loss) |  |  |  |  |  |  |  |  | $ 9,651 | $ (26,550) | $ (158,656)

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