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TRADE ACCOUNTS RECEIVABLE - Changes in expected credit losses (Details) - Trade accounts receivable - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in allowance for doubtful accounts    
Beginning balance R$ (37,179) R$ (38,740)
Business combination with Fibria (5,947)  
Addition (18,650) (11,578)
Reversal 6,364 5,128
Write-off 13,383 8,993
Exchange variation 33 (982)
Ending balance R$ (41,996) R$ (37,179)