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Commitments And Contingencies (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Apr. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) item $ / Boe | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) | Sep. 25, 2018 USD ($) | Jun. 30, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Abandonment Funding |  |  |  |  | $ 11,571 | $ 10,808 |  | $ 10,808 |  |
Percentage of share in charter payment |  |  |  |  | 31.10% |  |  |  |  |
Share in charter payment, approximate annual amount |  |  |  |  | $ 9,700 |  |  |  |  |
Liabilities, guarantees' fair value |  |  |  |  | $ 300 | 500 |  |  |  |
Contractual obligation |  |  |  |  |  |  |  |  |  | $ 5,100
Charter fee for production up to 20,000 BOPD | $ / Boe |  |  |  |  | 0.93 |  |  |  |  |
Charter fee for those bbls produced in excess of 20,000 BOPD | $ / Boe |  |  |  |  | 2.50 |  |  |  |  |
Company's share of charter expense |  |  |  |  | $ 10,800 | 12,800 | $ 11,200 |  |  |
Rent expense, operating leases |  |  |  |  | $ 1,300 | 2,400 | 4,500 |  |  |
Number of drilled wells required by agreement | item |  |  |  |  | 2 |  |  |  |  |
Number of appraisal wells required by agreement | item |  |  |  |  | 2 |  |  |  |  |
Estimated costs of wells, gross amount |  |  |  |  | $ 61,200 |  |  |  |  |
Estimated costs of wells |  |  |  |  | 20,500 |  |  |  |  |
Estimated costs of technical studies |  |  |  |  | 1,300 |  |  |  |  |
Estimated costs of technical studies, net |  |  |  |  | 400 |  |  |  |  |
Accrued estimated settlement |  |  |  |  |  | 500 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Payment of payroll taxes | $ 1,300 |  |  |  |  |  |  |  |  |
Gabon |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Discount |  |  | 25.00% | 15.00% |  |  |  |  |  |
Contractual obligation |  |  |  | $ 1,700 | 1,100 | $ 1,200 | 1,700 |  | $ 21,800 |
Accrued liabilities, end of drilling activities, gross amount |  |  |  |  | 5,000 |  |  |  |  |
Accrued liabilities, end of drilling activities |  |  |  |  | $ 1,700 |  |  |  |  |
Number of technical studies required | item |  |  |  |  | 2 |  |  |  |  |
Additional percent of revenue for provisions |  | 1.00% |  |  |  |  |  |  |  |
Percent of investment cost which are cost recoverable |  |  |  |  |  | 75.00% |  |  |  |
Accrued Payroll Taxes |  |  |  | $ 1,000 | $ 1,300 |  | $ 1,000 |  |  |
Gabon | Gabon DMO [Member] |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 1,200 | $ 1,300 |  |  |  |
Gabon | PID And PIH [Member] |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 1,900 | $ 1,400 |  |  |  |
Full Charter Payment [Member] |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 53,928 |  |  |  |  |
Abandonment cost related to annual funding |  |  |  |  | 61,800 |  |  |  |  |
Full Charter Payment [Member] | Offshore Gabon |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Abandonment funding |  |  |  |  | 37,400 |  |  |  |  |
VAALCO ENERGY, INC. |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual obligation |  |  |  |  | 16,747 |  |  |  |  |
VAALCO ENERGY, INC. | Offshore Gabon |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Abandonment funding |  |  |  |  | 11,600 |  |  |  |  |
VAALCO ENERGY, INC. | Full Charter Payment [Member] |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Abandonment cost related to annual funding |  |  |  |  | $ 19,200 |  |  |  |  |

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