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Inventories (Table) | 12 Months Ended
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Dec. 31, 2018
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 |  | 12/31/2018 ThUS$ |  |  | 12/31/2017 ThUS$ |  |  | 12/31/2016 ThUS$ |
Raw material reserves |  |  | 6,764 |  |  |  | 9,364 |  |  |  | 7,536 |
Supplies for production reserves |  |  | 26,840 |  |  |  | 22,257 |  |  |  | 23,610 |
Products-in-progress reserves |  |  | 423,621 |  |  |  | 456,333 |  |  |  | 482,261 |
Finished product reserves |  |  | 456,449 |  |  |  | 414,120 |  |  |  | 479,665 |
Total |  |  | 913,674 |  |  |  | 902,074 |  |  |  | 993,072 |
Disclosure of information about inventory reserves [Text Block] | The breakdown of inventory reserves is detailed as follows:
Type of inventory |  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Raw material reserves |  |  | 1,838 |  |  |  | 93 |  |  |  | 93 |
Supplies for production |  |  | - |  |  |  | - |  |  |  | 920 |
Products-in-progress reserves |  |  | 82,673 |  |  |  | 80,249 |  |  |  | 50,925 |
Finished product reserves |  |  | 20,771 |  |  |  | 15,942 |  |  |  | 29,357 |
Total |  |  | 105,282 |  |  |  | 96,284 |  |  |  | 81,295 |
Disclosure of movements in provisions for inventories [Text Block] | As of December 31, 2018 and, 2017, movements in provisions are detailed as follows:
Conciliation |  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Beginning balance |  |  | 96,284 |  |  |  | 81,295 |  |  |  | 80,369 |
Increase in Lower Value (1) |  |  | 7,845 |  |  |  | 19,515 |  |  |  | 2,255 |
Additional Provision Differences of Inventory. ( 2 ) |  |  | 3,176 |  |  |  | 573 |  |  |  | 6,071 |
Increase / Decrease eventual differences and others ( 3 ) |  |  | 2,436 |  |  |  | (178 | ) |  |  | (6,339 | )
Provision Used |  |  | (4,459 | ) |  |  | (4,921 | ) |  |  | (1,061 | )
Total changes |  |  | 8,998 |  |  |  | 14,989 |  |  |  | 926 |
Final balance |  |  | 105,282 |  |  |  | 96,284 |  |  |  | 81,295 |
| (1) | There are three types of Lower Value Provisions: Economic Realizable Lower Value, Potential Inventory with Uncertain Future Use and 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 diverse provision percentages based on the complexity in the measurement and rotation of stock, as well as standard differences based on previous profit and loss, as is the case with provisions in Commercial Offices.

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