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CASH AND CASH EQUIVALENTS (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of cash and cash equivalents [text block] [Abstract]  
Schedule of cash and cash equivalents [text block]
   As of
December 31,
2019		   As of
December 31,
2018		 
   ThUS$   ThUS$ 
Cash on hand   4,982    8,974 
Bank balances   329,632    331,218 
Overnight   350,080    282,164 
Total Cash   684,694    622,356 
Cash equivalents          
Time deposits   165,791    415,633 
Mutual funds   222,094    43,653 
Total cash equivalents   387,885    459,286 
Total cash and cash equivalents   1,072,579    1,081,642 
Schedule of cash and cash equivalents denominated by currencies [text block] Cash and cash equivalents are denominated in the following currencies:

   As of   As of 
   December 31,   December 31, 
Currency  2019   2018 
   ThUS$   ThUS$ 
Argentine peso   16,579    17,786 
Brazilian real   197,354    131,760 
Chilean peso   50,521    415,713 
Colombian peso   48,191    10,843 
Euro   21,927    20,339 
US Dollar   667,785    394,215 
Other currencies   70,222    90,986 
Total   1,072,579    1,081,642