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Borrowing costs (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
 
 
12/31/2018
 
 
12/31/2017
 
 
 
 
 
 
 
 
Capitalization rate of costs for capitalized interest, property, plant and equipment
 
 
4
%
 
 
4
%
Amount of costs for interest capitalized in ThUS$
 
 
5,021
 
 
 
4,382