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Financial risk management - Interest rate risk (Details) - Interest rate risk - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 1,351,577 | $ 1,188,163
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on debt | $ 76,000 | 84,000
Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 106,709 | 314,108
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on pre-tax earnings | $ 1,100 | 3,200
Unsecured notes | Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 1,189,976 | 1,188,163
Egypt limited recourse debt facilities | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 101,226 | 241,190
Other limited recourse debt facilities | Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 161,601 | 0
Other limited recourse debt facilities | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 5,483 | $ 72,918

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