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SHAREHOLDERS' EQUITY - Treasury shares (Details) - BRL (R$) R$ / shares in Units, R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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SHAREHOLDERS' EQUITY |  |  |
Quantity | 12,042,004 | 12,042,004 | 12,042,004
Average cost per share | R$ 18.13 | R$ 18.13 | R$ 18.13
Historical value | R$ 218,265 | R$ 218,265 | R$ 218,265
Market value | R$ 704,939 | R$ 477,827 | R$ 458,560

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