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SHAREHOLDERS' EQUITY - Dividends (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Apr. 18, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SHAREHOLDERS' EQUITY        
Minimum mandatory dividend, as a percentage of adjusted net income   25.00%    
Minimum mandatory dividend, as a percentage of consolidated operating cash generation   10.00%    
Dividends recognised as distributions to owners of parent R$ 600,000   R$ 29,976  
Dividends paid from reserves 596,534 R$ 596,534    
Dividends distributed   R$ 0 3,466  
Minimum mandatory dividends - 25% R$ 3,466   R$ 3,466 R$ 180,280