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Commitments and Contingencies (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) $ / d item | Dec. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Mar. 31, 2019 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |
Abandonment funding |  | $ 11,227 | $ 11,371 |  | $ 11,390
Number of drilled wells required by agreement | item |  | 2 |  |  |
Number of appraisal wells required by agreement | item |  | 2 |  |  |
Day rate of drilling rig contract | $ / d |  | 75,000 |  |  |
Potential Fees From Customs Audits [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency |  | $ 3,700 |  |  |
Etame Marine Block [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Estimated abandonment costs |  | 19,200 |  |  |
Abandonment funding |  | 11,200 |  |  |
Loss contingency |  | $ 4,400 |  | $ 4,400 |
Payment of joint venture audit settlement | $ 1,100 |  |  |  |
FPSO Charter [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Number of extensions | item |  | 2 |  |  |
Period of charter |  | 1 year |  |  |
Guarantee liability |  | $ 300 | $ 400 |  |
Percentage of share in charter payment |  | 31.10% |  |  |
Share in charter payment, approximate annual amount |  | $ 9,700 |  |  |
Full Charter Payment [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Contractual obligation |  | 47,500 |  |  |
Contractual obligation |  | 47,500 |  |  |
Consortium [Member] | Etame Marine Block [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Estimated abandonment costs |  | 61,800 |  |  |
Abandonment funding |  | 36,100 |  |  |
Consortium [Member] | FPSO Charter [Member] |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Maximum exposure |  | $ 47,500 |  |  |

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