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Income and other taxes - Net deferred income tax liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | $ (164,091) | $ (153,639) | $ (223,757)
Deferred tax assets | 102,341 | 137,341 | 61,881
Deferred tax liabilities | (266,432) | (290,980) | $ (285,638)
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (403,705) | (419,982) |
Deferred tax assets | (189,368) | (197,931) |
Deferred tax liabilities | (214,337) | (222,051) |
Repatriation taxes |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (87,239) | (85,364) |
Deferred tax assets | 0 | 0 |
Deferred tax liabilities | (87,239) | (85,364) |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (11,670) | (19,956) |
Deferred tax assets | (3,740) | (4,981) |
Deferred tax liabilities | (7,930) | (14,975) |
Temporary differences including temporary differences with liability balances |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | (502,614) | (525,302) |
Deferred tax assets | (193,108) | (202,912) |
Deferred tax liabilities | (309,506) | (322,390) |
Non-capital loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 244,576 | 280,931 |
Deferred tax assets | 244,576 | 280,931 |
Deferred tax liabilities | 0 | 0 |
Share-based compensation |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 19,920 | 8,590 |
Deferred tax assets | 2,946 | 935 |
Deferred tax liabilities | 16,974 | 7,655 |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 74,027 | 82,142 |
Deferred tax assets | 47,927 | 58,387 |
Deferred tax liabilities | 26,100 | 23,755 |
Temporary differences including temporary differences with asset balances |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Net | 338,523 | 371,663 |
Deferred tax assets | 295,449 | 340,253 |
Deferred tax liabilities | $ 43,074 | $ 31,410 |

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