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EMPLOYEE BENEFITS - Summary (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
EMPLOYEE BENEFITS    
Plan assets R$ 17,952 R$ 1,149
Total liabilities 1,356,717 1,424,864
Current 157 253
Non-current 1,356,560 1,424,611
Defined contribution pension plan    
EMPLOYEE BENEFITS    
Plan assets 17,952 1,149
Defined benefit pension plan    
EMPLOYEE BENEFITS    
Total liabilities 1,057,846 1,084,758
Post-employment health care benefit    
EMPLOYEE BENEFITS    
Total liabilities 272,369 316,230
Retirement and termination benefits    
EMPLOYEE BENEFITS    
Total liabilities R$ 26,502 R$ 23,876