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BORROWINGS (Borrowings by currency) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 1,722,893 $ 2,188,674
Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,592,944 2,023,051
Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 129,949 165,623
United States of America, Dollars | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,557,483 1,977,617
United States of America, Dollars | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 113,268 148,712
Argentina, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 8 10
Mexico, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 6,256 14,789
Colombia, Pesos | Floating Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings 29,197 30,634
Colombia, Pesos | Fixed Rate    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 16,681 $ 16,912