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PROPERTY, PLANT AND EQUIPMENT - Impairment (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Land, buildings and construction    
PROPERTY, PLANT AND EQUIPMENT    
Carrying value of impaired assets R$ 126,790 R$ 118,348
Machines, equipment, and installations    
PROPERTY, PLANT AND EQUIPMENT    
Carrying value of impaired assets 569,303 783,183
Property, plant and equipment under construction    
PROPERTY, PLANT AND EQUIPMENT    
Carrying value of impaired assets R$ 543,726 R$ 543,726