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Commitments and Contingencies (Narrative) (Details) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) | Jan. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) $ / bbl $ / d item bbl | Dec. 31, 2018 USD ($) | Jul. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 26, 2018 USD ($) | Sep. 17, 2018 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Abandonment Funding |  |  | $ 11,112 | $ 11,571 |  |  |  |
Accrued liabilities and other |  |  | $ 23,886 | 14,138 |  |  |  |
Charter fee for production up to 20,000 BOPD | $ / bbl |  |  | 0.93 |  |  |  |  |
Charter fee amount threshold | bbl |  |  | 20,000 |  |  |  |  |
Charter fee for those bbls produced in excess of 20,000 BOPD | $ / bbl |  |  | 2.50 |  |  |  |  |
Company's share of charter expense |  |  |  | 10,800 |  |  |  |
Number of drilled wells required by agreement | item |  |  | 2 |  |  |  |  |
Number of appraisal wells required by agreement | item |  |  | 2 |  |  |  |  |
Estimated costs of wells, gross amount |  |  | $ 68,500 |  |  |  |  |
Estimated costs of wells |  |  | 23,000 |  |  |  |  |
Estimated costs of technical studies, net |  |  | 400 |  |  |  |  |
Abandonment cost related to annual funding |  |  | 61,800 |  |  |  |  |
Abandonment cost related to annual funding, net |  |  | $ 19,200 |  |  |  |  |
Payment of other taxes |  | $ 1,300 |  |  |  |  |  |
Day rate of drilling rig contract | $ / d |  |  | 75,000 |  |  |  |  |
Potential Fees From Customs Audits [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Accrued liabilities and other |  |  |  | 1,300 |  |  |  |
Gabon |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Abandonment Funding |  |  | $ 11,100 |  |  |  |  |
Contractual obligation |  |  |  |  |  |  |  | $ 21,800
Accrued liabilities, end of drilling activities, gross amount |  |  |  |  |  |  | $ 5,000 |
Accrued liabilities, end of drilling activities |  |  |  |  |  | $ 1,700 |  |
Abandonment funding, gross |  |  | 35,700 |  |  |  |  |
Loss contingency |  |  | $ 4,400 |  | $ 4,400 |  |  |
Gabon | Subsequent Event |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Payment of joint venture audit settlement | $ 1,100 |  |  |  |  |  |  |
Offshore Gabon |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Production License Agreement Term Extended By Government |  |  | 5 years |  |  |  |  |
Percentage of annual funding over seven years |  |  | 12.14% |  |  |  |  |
Funding period for initial rate |  |  | 7 years |  |  |  |  |
Second funding period of production license |  |  | 3 years |  |  |  |  |
Percentage of annual funding over last three years |  |  | 5.00% |  |  |  |  |
Funding period abandonment funding |  |  | 10 years |  |  |  |  |
Number of contract extension periods | item |  |  | 2 |  |  |  |  |
Full Charter Payment [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Contractual obligation |  |  | $ 53,900 | 53,928 |  |  |  |
FPSO Charter [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of extensions | item |  |  | 2 |  |  |  |  |
Period of charter (in years) |  |  | 1 year |  |  |  |  |
Percentage of share in charter payment |  |  | 31.10% |  |  |  |  |
Share in charter payment, approximate annual amount |  |  | $ 9,700 |  |  |  |  |
Liabilities, guarantees' fair value |  |  | $ 200 | $ 200 |  |  |  |

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