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BORROWINGS (Borrowings by currency) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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

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