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TRADE ACCOUNTS RECEIVABLE - Changes in expected credit losses (Details) - Trade accounts receivable - BRL (R$)
R$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Changes in allowance for doubtful accounts    
Beginning balance R$ (41,889) R$ (41,996)
Addition (4,429) (9,350)
Reversal 273 3,328
Write-off 3,625 7,737
Exchange rate variation (360) 1,608
Ending balance R$ (42,060) R$ (41,889)