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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Earnings Per Share Explanatory [Abstract] |
Earnings Per Share Explanatory [Text Block] | As expressed, earnings per share are detailed as follows:
Basic earnings per share |  | For the year ended ‎ December 31, 2019 |  |  | For the year ended ‎ December 31, 2018 |  |  | For the year ended ‎ December 31, 2017 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Net profit attributable to owners of the parent |  |  | 278,115 |  |  |  | 439,830 |  |  |  | 427,697 |
Basic earnings per share |  | For the year ended ‎ December 31, 2019 |  |  | For the year ended ‎ December 31, 2018 |  |  | For the year ended ‎ December 31, 2017 |
|  | Units |  |  | Units |  |  | Units |
Number of common shares in circulation |  |  | 263,196,524 |  |  |  | 263,196,524 |  |  |  | 263,196,524 |
Basic earnings per share (US$ per share) |  |  | 1.0567 |  |  |  | 1.6711 |  |  |  | 1.6250 |

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