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Basis of preparation of the interim condensed consolidated financial statements - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Cumulative effect of modification loss |  | $ 52,691 | $ 18,428 | $ 76,919 | $ 35,243
Retained Earnings |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Cumulative effect of modification loss |  |  |  | $ 76,919 | $ 35,243
Retained Earnings | IFRS 9 |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Cumulative effect of modification loss | $ (8,542) |  |  |  |

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