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EMPLOYEE BENEFIT PLANS - Changes in actuarial liability (Details) - Defined benefit plan - BRL (R$)
R$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Changes in actuarial liability    
Actuarial liabilities balance, beginning of the year R$ 736,179 R$ 430,427
Business combination with Fibria   147,877
Interest on employee benefits 26,527 44,496
Actuarial loss   147,640
Exchange rate variation 449  
Benefits paid in the year (19,050) (34,261)
Actuarial liabilities balance, end of the year R$ 744,105 R$ 736,179