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Borrowing costs (Tables) | 12 Months Ended
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Dec. 31, 2019
Borrowing costs [abstract] |
Disclosure of rates and costs for capitalized interest of property, plant and equipment [Text Block] | The rates and costs for capitalized interest of property, plant and equipment are detailed as follows:
Costs of capitalized interest |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |
Capitalization rate of costs for capitalized interest |  |  | 4 | % |  |  | 4 | %
Amount of interest capitalized in ThUS$ |  |  | 7,841 |  |  |  | 5,021 |

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