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EMPLOYEE BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of employee benefits [text block] [Abstract]  
Disclosure of defined benefit plans [text block]
   As of   As of 
   December 31,   December 31, 
   2019   2018 
   ThUS$   ThUS$ 
Retirements payments   64,824    56,126 
Resignation payments   9,722    8,802 
Other obligations   19,024    17,437 
Total liability for employee benefits  93,570   82,365 
Disclosure of net defined benefit liability (asset) [text block]
       Increase (decrease)       Actuarial         
   Opening   current service   Benefits   (gains)   Currency   Closing 
   balance   provision   paid   losses   translation   balance 
   ThUS$   ThUS$   ThUS$   ThUS$   ThUS$   ThUS$ 
From January 1 to December 31, 2018   101,087    (7,384)   (6,018)   5,819    (11,139)   82,365 
From January 1 to December 31, 2019   82,365    11,242    (4,390)   10,636    (6,283)   93,570 
Schedule of principal assumptions
   For the period ended 
   December 31, 
Assumptions  2019   2018 
         
Discount rate   3.13%   4.27%
Expected rate of salary increase   4.5%   4.50%
Rate of turnover   6.04%   6.60%
Mortality rate   RV-2014    RV-2014 
Inflation rate   2.8%   2.7%
Retirement age of women   60    60 
Retirement age of men   65    65 
Disclosure of sensitivity analysis for actuarial assumptions [text block]
   Effect on the liability 
   As of   As of 
   December 31,   December 31, 
   2019   2018 
   ThUS$   ThUS$ 
Discount rate        
Change in the accrued liability an closing for increase in 100 p.b.   (7,257)   (6,538)
Change in the accrued liability an closing for decrease of 100 p.b.   5,365    4,918 
           
Rate of wage growth          
Change in the accrued liability an closing for increase in 100 p.b.   4,989    4,750 
Change in the accrued liability an closing for decrease of 100 p.b.   (7,159)   (6,547)
Disclosure of additional information about defined benefit plans [text block]
   As of
December 31,
2019		   As of
December 31,
2018		 
   ThUS$   ThUS$ 
           
Profit-sharing and bonuses (*)   91,153    81,222 
(*)Accounts payables to employees (Note 20 letter b)
Schedule of employment expenses [Text Block]
   For the year ended 
   December 31, 
   2019   2018   2017 
   ThUS$   ThUS$   ThUS$ 
Salaries and wages   1,478,804    1,481,357    1,604,552 
Short-term employee benefits   147,576    132,394    145,245 
Termination benefits   54,256    54,007    85,070 
Other personnel expenses   114,126    152,211    188,767 
Total  1,794,762   1,819,969   2,023,634