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EMPLOYEE BENEFITS - Post-employment health care benefit plan - Change in obligation (Details) - Post-employment health care benefit - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EMPLOYEE BENEFITS      
Cost of service R$ 4,964 R$ 3,302 R$ 4,144
Interest expense 11,311 10,656 11,082
Present value of the defined benefit obligations      
EMPLOYEE BENEFITS      
Obligation at the beginning of the year 298,989 272,959 316,364
Cost of service 4,964 3,302 4,144
Interest expense 11,311 10,656 11,082
Past service cost (660) (2,717) (40,740)
Contributions from participants 2,349 2,088 1,496
Payment of benefits (20,870) (15,331) (18,655)
Gain (loss) on remeasurement (23,533) 11,202 (40,841)
Exchange variations 90,394 16,830 40,109
Obligation at the end of the year R$ 362,944 R$ 298,989 R$ 272,959