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Significant accounting policies - Anticipated changes to International Financial Reporting Standards (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Non-current assets |  | $ 3,356,923 | $ 3,367,615
Retained earnings |  | $ 1,145,476 | $ 1,088,150
IFRS 16, Leases |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Non-current assets | $ 410,000 |  |
Total liabilities | 450,000 |  |
Retained earnings | $ 40,000 |  |

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