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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

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