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Inventories (Table)
 12 Months Ended
Dec. 31, 2020
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,
2020
  
As of
December 31,
2019
 
 
 
ThUS$
 
 
ThUS$
 
Raw material  10,694   7,287 
Production supplies  31,007   26,064 
Products-in-progress  487,830   457,563 
Finished product  563,497   492,424 
Total
 
 
1,093,028
 
 
 
983,338
 
Disclosure of information about inventory reserves [Text Block]
The breakdown of inventory allowances is detailed as follows:
 
Type of inventory
 
As of
December 31,
2020
  
As of
December 31,
2019
 
 
 
ThUS$
 
 
ThUS$
 
Raw material and supplies for production  1,934   2,488 
Products-in-progress  66,122   71,468 
Finished product  12,874   14,218 
Total
 
 
80,930
 
 
 
88,174
 
Disclosure of movements in provisions for inventories [Text Block]
As of December 31, 2020, and December 31, 2019, movements in provisions are detailed as follows:
 
Conciliation
 
As of
December 31,
2020
  
As of
December 31,
2019
  
As of
December 31,
2018
 
 
 
ThUS$
 
 
ThUS$
 
 
ThUS$
 
Beginning balance
 
 
88,174
 
 
 
105,282
 
 
 
96,284
 
Increase in Lower Value (1)  (5,404)  (6,987)  7,845 
Additional Provision Differences of Inventory (2)  (704)  (123)  3,176 
Increase / Decrease eventual differences and others (3)  1,244   (6,262)  2,436 
Provision Used  (2,380)  (3,736)  (4,459)
Total changes
 
 
(7,244
)
 
 
(17,108
)
 
 
8,998
 
Final balance
 
 
80,930
 
 
 
88,174
 
 
 
105,282
 
 
 (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.
 (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.