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TRADE ACCOUNTS RECEIVABLE - Trade accounts receivable by maturity (Details) - Trade accounts receivable - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 3,035,817 R$ 2,537,058
Neither past due nor impaired | Current    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 2,552,459 2,119,188
Past due but not impaired | Up to 30 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 180,909 291,050
Past due but not impaired | From 31 to 60 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 148,388 54,845
Past due but not impaired | From 61 to 90 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 20,448 10,982
Past due but not impaired | From 91 to 120 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 20,680 7,446
Past due but not impaired | From 121 to 180 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 17,899 6,285
Past due but not impaired | More than 180 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 95,034 R$ 47,262