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BORROWINGS (Borrowings by currency) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 2,036,957 $ 3,221,907
Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,747,074 2,075,276
Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 289,883 1,146,631
United States of America, Dollars | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,747,074 2,061,106
United States of America, Dollars | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 262,873 791,158
Argentina, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 0 2,377
Argentina, Pesos | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 0 328,060
Colombia, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 0 11,793
Colombia, Pesos | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 17,009 18,500
Guatemala, Quetzales | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 10,001 $ 8,913