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EMPLOYEE BENEFITS - Summary (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
EMPLOYEE BENEFITS    
Plan assets R$ 39,196 R$ 45,381
Total liabilities 1,861,439 1,470,444
Current 208 495
Non-current 1,861,231 1,469,949
Defined contribution pension plan    
EMPLOYEE BENEFITS    
Plan assets 39,196 45,381
Defined benefit pension plan    
EMPLOYEE BENEFITS    
Total liabilities 1,441,592 1,138,592
Post-employment health care benefit    
EMPLOYEE BENEFITS    
Total liabilities 362,944 298,989
Retirement and termination benefits    
EMPLOYEE BENEFITS    
Total liabilities R$ 56,903 R$ 32,863