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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