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ALLOWANCES AND PROVISIONS - NON CURRENT AND CURRENT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Non-current provisions [abstract] |  |
Non-current provisions, beginning of the year | $ 6,950 |
Non-current provisions, end of the year | 768,517 | $ 6,950
Legal claims and other matters |  |
Non-current provisions [abstract] |  |
Non-current provisions, beginning of the year | 6,950 | 8,142
Translation differences | (39,757) | (1,290)
Acquisition of business (note 3) | 799,938 |
Additions | 3,112 | 2,757
Reversals | (329) | (1,079)
Uses | 1,397 | 1,580
Non-current provisions, end of the year | 768,517 | 6,950
Asset retirement obligation |  |
Non-current provisions [abstract] |  |
Non-current provisions, beginning of the year | 18,301 | 18,273
Translation differences | 853 | (3,102)
Acquisition of business (note 3) | 0 |
Additions | 8,675 | 3,130
Reversals | 0 | 0
Uses | 0 | 0
Non-current provisions, end of the year | 27,829 | 18,301
Current provisions [abstract] |  |
Current provisions, beginning of the year | 4,262 | 1,132
Translation differences | 246 | (276)
Acquisition of business (note 3) | 0 |
Additions | 443 | 4,031
Reversals | 0 | 0
Uses | 2,292 | 625
Current provisions, end of the year | 2,659 | 4,262
Allowance for doubtful accounts |  |
Current provisions [abstract] |  |
Current provisions, beginning of the year | 6,019 | 7,585
Translation differences | (504) | (656)
Acquisition of business (note 3) | 10,822 |
Additions | 1,365 | 2,574
Reversals | (680) | (2,286)
Uses | 479 | 1,198
Current provisions, end of the year | 16,543 | 6,019
Obsolescence allowance |  |
Current provisions [abstract] |  |
Current provisions, beginning of the year | 33,433 | 32,445
Translation differences | (860) | (900)
Acquisition of business (note 3) | 12,385 |
Additions | 9,959 | 16,616
Reversals | (13,987) | (12,016)
Uses | 4,733 | 2,712
Current provisions, end of the year | $ 36,197 | $ 33,433

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