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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Earnings Per Share Explanatory [Abstract]  
Earnings Per Share Explanatory [Text Block]
As expressed, earnings per share are detailed as follows:
 
Basic earnings per share
 
12/31/2018
ThUS$
 
 
12/31/2017
ThUS$
 
 
12/31/2016
ThUS$
 
 
 
 
 
 
 
 
 
 
 
Earnings (losses) attributable to owners of the parent
 
 
439,830
 
 
 
427,697
 
 
 
278,290
 
 
 
 
12/31/2018
Units
 
 
12/31/2017
Units
 
 
12/31/2016
Units
 
Number of common shares in circulation
 
 
263,196,524
 
 
 
263,196,524
 
 
 
263,196,524
 
 
 
 
12/31/2018
 
 
12/31/2017
 
 
12/31/2016
 
 
 
 
 
 
 
 
 
 
 
Basic earnings per share (US$ per share)
 
 
1.6711
 
 
 
1.6250
 
 
 
1.05732