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4. CASH AND CASH EQUIVALENTS (Details) € in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 GBP (£) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 GBP (£)
--- | --- | --- | --- | --- | --- | --- | --- | ---
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash and bank accounts |  |  | R$ 2,439,072 |  |  |  | R$ 2,289,787 |  |
Cash equivalents |  |  | 3,667,132 |  |  |  | 883,265 |  |
Cash and cash equivalents |  |  | R$ 7,576,625 |  |  |  | 4,237,785 |  |
U.S. dollars (USD) |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash and bank accounts | $ |  | $ 1,185,208 |  |  |  | $ 1,356,128 |  |  |
U.S. dollars (USD) | Term Deposit [member] |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents | $ |  | $ 198,878 |  |  |  | 270,714 |  |  |
Average rate (p.a.) | [1] | 0.71% | 0.71% | 0.71% | 0.71% |  |  |  |
U.S. dollars (USD) | Overnight [member] |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents | $ |  | $ 1,220,232 |  |  |  | $ 689,874 |  |  |
Average rate (p.a.) | [1] | 0.07% | 0.07% | 0.07% | 0.07% |  |  |  |
Brazilian Reais |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash and bank accounts |  |  | R$ 112,181 |  |  |  | 167,051 |  |
Brazilian Reais | Investment funds [member] |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | R$ 4,684 |  |  |  | 3,507 |  |
Average rate (p.a.) | [1] | 0.05% | 0.05% | 0.05% | 0.05% |  |  |  |
Brazilian Reais | Bank deposit certificates [member] |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | R$ 3,662,448 |  |  |  | R$ 879,758 |  |
Average rate (p.a.) | [1] | 1.86% | 1.86% | 1.86% | 1.86% |  |  |  |
Euros (EUR) |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash and bank accounts | € |  |  |  | € 54,687 |  |  |  | € 71,626 |
Other Currencies [member] |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash and bank accounts | £ |  |  |  |  | £ 1,086,996 |  |  |  | £ 694,982
Other Currencies [member] | Term Deposit [member] |  |  |  |  |  |  |  |  |
CashAndCashEquivalentLineItems [Line Items] |  |  |  |  |  |  |  |  |
Cash equivalents | £ |  |  |  |  | £ 51,311 |  |  |  | £ 104,145
Average rate (p.a.) | [1] |  |  |  |  |  |  |  |
[1] | Weighted average annual rate.

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