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Long-term debt - Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | $ 1,768,853 | $ 1,458,286
Egypt limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 75,165 | 101,226
Other limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 158,026 | 167,084
Unsecured notes |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,535,662 | $ 1,189,976
Carrying amount |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,789,258 |
Carrying amount | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 39,377 |
Carrying amount | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 40,680 |
Carrying amount | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 276,819 |
Carrying amount | 2023 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 10,778 |
Carrying amount | 2024 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 310,841 |
Carrying amount | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,110,763 |
Carrying amount | Egypt limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 77,683 |
Carrying amount | Egypt limited recourse debt facilities | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 29,525 |
Carrying amount | Egypt limited recourse debt facilities | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 31,552 |
Carrying amount | Egypt limited recourse debt facilities | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 16,606 |
Carrying amount | Egypt limited recourse debt facilities | 2023 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 0 |
Carrying amount | Egypt limited recourse debt facilities | 2024 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 0 |
Carrying amount | Egypt limited recourse debt facilities | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 0 |
Carrying amount | Other limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 161,575 |
Carrying amount | Other limited recourse debt facilities | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 9,852 |
Carrying amount | Other limited recourse debt facilities | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 9,128 |
Carrying amount | Other limited recourse debt facilities | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 10,213 |
Carrying amount | Other limited recourse debt facilities | 2023 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 10,778 |
Carrying amount | Other limited recourse debt facilities | 2024 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 10,841 |
Carrying amount | Other limited recourse debt facilities | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 110,763 |
Carrying amount | Unsecured notes |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,550,000 |
Carrying amount | Unsecured notes | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 0 |
Carrying amount | Unsecured notes | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 0 |
Carrying amount | Unsecured notes | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 250,000 |
Carrying amount | Unsecured notes | 2023 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 0 |
Carrying amount | Unsecured notes | 2024 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 300,000 |
Carrying amount | Unsecured notes | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | $ 1,000,000 |

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