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v3.20.2

Commitments and Contingencies (Narrative) (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) km² | Jun. 30, 2020 USD ($) | Oct. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2019 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Abandonment funding |  |  |  | $ 11,885 | $ 11,371 | $ 11,112 |
Etame Marine Block [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Estimated abandonment costs |  |  |  | 19,200 |  |  |
Abandonment funding |  |  |  | 11,900 |  |  |
Loss contingency |  |  |  | $ 4,400 |  |  | $ 4,400
Payment of joint venture audit settlement |  | $ 800 | $ 1,100 |  |  |  |
Area of three-dimensional seismic data | km² | 742 |  |  |  |  |  |
Etame Marine Block [Member] | Minimum [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Expected time to complete acquisition of data | 2 months |  |  |  |  |  |
Expected cost of data acquisition | $ 4,000 |  |  |  |  |  |
Etame Marine Block [Member] | Maximum [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Expected time to complete acquisition of data | 3 months |  |  |  |  |  |
Expected cost of data acquisition | $ 5,000 |  |  |  |  |  |
FPSO Charter [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Number of extensions | item |  |  |  | 2 |  |  |
Period of charter |  |  |  | 1 year |  |  |
Guarantee liability |  |  |  | $ 400 | $ 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 |  |  |  | 65,100 |  |  |
Consortium [Member] | Etame Marine Block [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Estimated abandonment costs |  |  |  | 61,800 |  |  |
Abandonment funding |  |  |  | 38,300 |  |  |
Consortium [Member] | FPSO Charter [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Maximum exposure |  |  |  | $ 65,100 |  |  |

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