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Inventories (Table) | 12 Months Ended
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Dec. 31, 2019
Disclosure Of Inventories Explanatory [Abstract] |
Disclosure of detailed information about inventories [Text Block] | The composition of inventory at each period-end is as follows:
Type of inventory |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |
Raw material |  |  | 7,287 |  |  |  | 6,764 |
Supplies for production |  |  | 26,064 |  |  |  | 26,840 |
Products-in-progress |  |  | 457,563 |  |  |  | 423,621 |
Finished product |  |  | 492,424 |  |  |  | 456,449 |
Total |  |  | 983,338 |  |  |  | 913,674 |
Disclosure of information about inventory reserves [Text Block] | The breakdown of inventory allowances is detailed as follows:
Type of inventory |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |
Raw material and supplies for production |  |  | 2,488 |  |  |  | 1,838 |
Products-in-progress |  |  | 71,468 |  |  |  | 82,673 |
Finished product |  |  | 14,218 |  |  |  | 20,771 |
Total |  |  | 88,174 |  |  |  | 105,282 |
Disclosure of movements in provisions for inventories [Text Block] | As of December 31, 2019 and December 31, 2018, movements in provisions are detailed as follows:
Conciliation |  | As of December 31, ‎ 2019 |  |  | As of December 31, ‎ 2018 |  |  | As of December 31, ‎ 2017 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Beginning balance |  |  | 105,282 |  |  |  | 96,284 |  |  |  | 81,295 |
Increase (decrease) in lower value provision (1) |  |  | (6,987 | ) |  |  | 7,845 |  |  |  | 19,515 |
Increase (decrease) in provision relating to differences of inventory (2) |  |  | (123 | ) |  |  | 3,176 |  |  |  | 573 |
Increase / decrease in provision relating to eventual differences and others (3) |  |  | (6,262 | ) |  |  | 2,436 |  |  |  | (178 | )
Provision used |  |  | (3,736 | ) |  |  | (4,459 | ) |  |  | (4,921 | )
Total changes |  |  | (17,108 | ) |  |  | 8,998 |  |  |  | 14,989 |
Final balance |  |  | 88,174 |  |  |  | 105,282 |  |  |  | 96,284 |
| (1) | There are three types of Lower Value Provisions: (a) Economic Realizable Lower Value, (b) Potential Inventory with Uncertain Future Use and (c) Reprocessing Costs of Off-Specification Products.
| (2) | Provisions for Inventory Differences generated when physical differences are detected when taking inventory, which exceed the tolerance levels for this process, At least two annual inventories are taken in the production sites and in the port in Chile (“zero sum” systems have immediate potential adjustments).
| (3) | This algorithm corresponds to the provision of diverse percentages based on the complexity in the measurement and rotation of stock, as well as standard differences based on previous results, as is the case with provisions relating to Commercial Offices.

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