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BORROWINGS (Borrowings by currency) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 3,221,907 $ 1,218,635
Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,075,276 813,709
Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,146,631 404,926
United States of America, Dollars | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,061,106 790,772
United States of America, Dollars | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 791,158 141,889
Argentina, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,377 0
Argentina, Pesos | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 328,060 234,576
Colombia, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 11,793 23,520
Colombia, Pesos | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 18,500 19,163
Guatemala, Quetzales | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 8,913 $ 8,715