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Income and other taxes - Net deferred income tax liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | $ (221,682) | $ (164,091) | $ (153,639)
Deferred tax assets | 59,532 | 102,341 | 137,341
Deferred tax liabilities | (281,214) | (266,432) | $ (290,980)
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (425,743) | (399,391) |
Deferred tax assets | (212,087) | (189,368) |
Deferred tax liabilities | (213,656) | (210,023) |
Repatriation taxes |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (94,446) | (87,239) |
Deferred tax assets | 0 | 0 |
Deferred tax liabilities | (94,446) | (87,239) |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (14,930) | (11,670) |
Deferred tax assets | (6,700) | (3,740) |
Deferred tax liabilities | (8,230) | (7,930) |
Temporary differences including temporary differences with liability balances |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (535,119) | (498,300) |
Deferred tax assets | (218,787) | (193,108) |
Deferred tax liabilities | (316,332) | (305,192) |
Non-capital loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 233,237 | 244,576 |
Deferred tax assets | 233,237 | 244,576 |
Deferred tax liabilities | 0 | 0 |
Share-based compensation |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 10,908 | 19,920 |
Deferred tax assets | 1,170 | 2,946 |
Deferred tax liabilities | 9,738 | 16,974 |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 69,292 | 69,713 |
Deferred tax assets | 43,912 | 47,927 |
Deferred tax liabilities | 25,380 | 21,786 |
Temporary differences including temporary differences with asset balances |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 313,437 | 334,209 |
Deferred tax assets | 278,319 | 295,449 |
Deferred tax liabilities | $ 35,118 | $ 38,760 |

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