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SHARE-BASED COMPENSATION PLAN - Amounts recognized in the financial Statements (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liabilities and equity      
Provision for phantom stock plan R$ 136,505 R$ 124,318  
Capital reserves 6,416,864 674,221  
Income Statement      
Total general and administrative expenses from share-based transactions (47,268) (131,609) R$ (33,713)
Stock options granted      
Liabilities and equity      
Capital reserves 5,979    
PSO      
Liabilities and equity      
Provision for phantom stock plan 136,505 124,318  
Income Statement      
Total general and administrative expenses from share-based transactions (46,389) (126,439) (32,192)
Common stock option plan      
Income Statement      
Total general and administrative expenses from share-based transactions (879) (5,170) R$ (1,521)
Common stock option plan | Stock options granted      
Liabilities and equity      
Capital reserves R$ 5,979 R$ 5,100