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Long-term debt - Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | $ 1,458,286 | $ 1,502,271
Egypt limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 101,226 | 241,190
Other limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 167,084 | 72,918
Unsecured notes |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,189,976 | $ 1,188,163
Carrying amount |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,475,851 |
Carrying amount | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 385,992 |
Carrying amount | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 39,977 |
Carrying amount | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 40,681 |
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 | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 721,604 |
Carrying amount | Egypt limited recourse debt facilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 105,323 |
Carrying amount | Egypt limited recourse debt facilities | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 27,640 |
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 | 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 | 170,528 |
Carrying amount | Other limited recourse debt facilities | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 8,352 |
Carrying amount | Other limited recourse debt facilities | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 10,452 |
Carrying amount | Other limited recourse debt facilities | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 9,129 |
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 | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 121,604 |
Carrying amount | Unsecured notes |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,200,000 |
Carrying amount | Unsecured notes | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 350,000 |
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 | Thereafter |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | $ 600,000 |

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