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Inventories (Table) | 12 Months Ended
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Dec. 31, 2017
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 |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |  | 12/31/2015 ThUS$ |
Raw material reserves |  |  | 9,364 |  |  | 7,536 |  |  | 4,844 |
Supplies for production reserves |  |  | 22,257 |  |  | 23,610 |  |  | 29,353 |
Products-in-progress reserves |  |  | 456,333 |  |  | 482,261 |  |  | 478,627 |
Finished product reserves |  |  | 414,120 |  |  | 479,665 |  |  | 491,022 |
Total |  |  | 902,074 |  |  | 993,072 |  |  | 1,003,846 |
Disclosure of information about inventory reserves [Text Block] | The breakdown of inventory reserves is detailed as follows:
Type of inventory |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |  | 12/31/2015 ThUS$ |
Raw material reserves |  |  | 93 |  |  | 93 |  |  | 93 |
Suministros para la producción |  |  | - |  |  | 920 |  |  | 920 |
Products-in-progress reserves |  |  | 80,249 |  |  | 50,925 |  |  | 53,187 |
Finished product reserves |  |  | 15,942 |  |  | 29,357 |  |  | 26,169 |
Total |  |  | 96,284 |  |  | 81,295 |  |  | 80,369 |
Disclosure of movements in provisions for inventories [Text Block] | As of December 31, 2017, 2016 and 2015, movements in provisions are detailed as follows:
Reconciliation |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |
Opening balance |  |  | 81,295 |  |  | 80,369 |  |  | 82,966 |
Changes |  |  |  |  |  |  |  |  |  |
Additional provisions |  |  | 21,953 |  |  | 9,831 |  |  | 18,461 |
Increase (decrease) in existing provisions |  |  | (6,964) |  |  | (8,905) |  |  | (21,058) |
Total changes |  |  | 14,989 |  |  | 926 |  |  | (2,597) |
Final Balance |  |  | 96,284 |  |  | 81,295 |  |  | 80,369 |

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