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Financial risk management - Interest rate risk (Details) - Interest rate risk - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 1,188,163 | $ 1,186,424
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on debt | $ 84,000 | 80,200
Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 314,108 | 369,782
Reasonably possible change in risk variable, percent | 1.00% |
Reasonably possible change in risk variable, impact on pre-tax earnings | $ 3,200 | 3,700
Unsecured notes | Fixed interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 1,188,163 | 1,186,424
Egypt limited recourse debt facilities | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | 241,190 | 288,515
Other limited recourse debt facilities | Variable interest rate |  |
Disclosure of financial instruments by type of interest rate [line items] |  |
Long-term debt | $ 72,918 | $ 81,267

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