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EARNINGS / (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of earnings per share [text block] [Abstract]  
Schedule of earning per share
   For the year ended 
   December 31, 
Basic earnings / (loss) per share  2019   2018   2017 
       Restated   Restated 
            
Earnings / (loss) attributable to owners of the parent (ThUS$)   190,430    309,811    108,896 
               
Weighted average number of shares, basic   606,407,693    606,407,693    606,407,693 
                
Basic earnings / (loss) per share (US$)   0.31403    0.51090    0.17958 
   For the year ended 
   December 31, 
Diluted earnings / (loss) per share  2019   2018   2017 
       Restated   Restated 
            
Earnings / (loss) attributable to owners of the parent (ThUS$)   190,430    309,811    108,896 
               
Weighted average number of shares, basic   606,407,693    606,407,693    606,407,693 
               
Weighted average number of shares, diluted   606,407,693    606,407,693    606,407,693 
                
Diluted earnings / (loss) per share (US$)   0.31403    0.51090    0.17958