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ALLOWANCES AND PROVISIONS - NON CURRENT AND CURRENT (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Non-current provisions [abstract]    
Non-current provisions, beginning of the year $ 613,352  
Non-current provisions, end of the year 80,570 $ 613,352
Current provisions [abstract]    
Uses   (6,898)
Legal claims and other matters    
Non-current provisions [abstract]    
Non-current provisions, beginning of the year 613,352 643,950
Translation differences (151,466) (25,701)
Additions 3,760 2,689
Reversals (384,933) (4,417)
Uses (143) (3,169)
Non-current provisions, end of the year 80,570 613,352
Asset retirement obligation    
Non-current provisions [abstract]    
Non-current provisions, beginning of the year 26,556 24,554
Translation differences (1,049) 1,077
Additions 16,166 925
Reversals 0 0
Uses 0 0
Non-current provisions, end of the year 41,673 26,556
Current provisions [abstract]    
Current provisions, beginning of the year 8,502 9,851
Translation differences (1,241) 348
Additions 3,633 5,201
Reversals 0 0
Uses (6,379)  
Current provisions, end of the year 4,515 8,502
Allowance for doubtful accounts    
Current provisions [abstract]    
Current provisions, beginning of the year 12,961 14,346
Translation differences (1,789) (285)
Additions 1,437 787
Reversals (1,101) (1,080)
Uses (1,008) (807)
Current provisions, end of the year 10,500 12,961
Obsolescence allowance    
Current provisions [abstract]    
Current provisions, beginning of the year 62,167 55,454
Translation differences 0 (458)
Additions 11,009 18,036
Reversals (12,288) (9,623)
Uses (2,278) (1,242)
Current provisions, end of the year $ 58,610 $ 62,167