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Earnings per share | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Earnings Per Share Explanatory [Abstract] |
Disclosure Of Earnings Per Share Explanatory [Text Block] | Note 20 Earnings per share Basic earnings per share are calculated by dividing net income attributable to the Company’s shareholders by the weighted average of the number of shares in circulation during that period. 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 |
The Company has not made any operations with a potential dilutive effect that assumes diluted earnings per share are different from the basic earnings per share.

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