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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, 2019
Dec. 31, 2018
Dec. 31, 2017
EMPLOYEE BENEFITS      
Cost of service R$ 3,302 R$ 4,144 R$ 4,441
Interest expense 10,656 11,082 12,162
Present value of the defined benefit obligations      
EMPLOYEE BENEFITS      
Obligation at the beginning of the year 272,959 316,364 305,447
Cost of service 3,302 4,144 4,441
Interest expense 10,656 11,082 12,162
Past service cost (2,717) (40,740) 5,769
Contributions from participants 2,088 1,496 1,556
Payment of benefits (15,331) (18,655) (14,230)
Gain (loss) on remeasurement 11,202 (40,841) (14,452)
Exchange variations 16,830 40,109 15,671
Obligation at the end of the year R$ 298,989 R$ 272,959 R$ 316,364