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DERIVATIVE FINANCIAL INSTRUMENTS (Exchange rate derivative contract) (Details) $ in Thousands, € in Millions, $ in Billions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 COP ($) | Dec. 31, 2019 USD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial assets, at fair value | $ 496,832 |  |  | $ 239,876
Financial liabilities, at fair value | (6,358) |  |  | (3,024)
Forward contract |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities, at fair value | (4,263) |  |  | (1,811)
Long | Forward contract |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | € |  | € 53.7 |  |
Long | Euro Member Countries, Euro | Forward contract |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial assets, at fair value | 1,572 |  |  | 1,196
Short | Forward contract |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount |  |  | $ 291.5 |
Short | Colombia, Pesos | Forward contract |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities, at fair value | $ (5,835) |  |  | $ (3,007)

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