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TRADE ACCOUNTS RECEIVABLE - Trade accounts receivable by maturity (Details) - Trade accounts receivable - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 2,915,206 R$ 3,035,817
Neither past due nor impaired | Current    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 2,603,229 2,552,459
Past due but not impaired | Up to 30 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 209,210 180,909
Past due but not impaired | From 31 to 60 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 51,420 148,388
Past due but not impaired | From 61 to 90 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 2,062 20,448
Past due but not impaired | From 91 to 120 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 6,665 20,680
Past due but not impaired | From 121 to 180 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 8,618 17,899
Past due but not impaired | More than 180 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 34,002 R$ 95,034