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12. FINANCIAL INSTRUMENTS (Details 5) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Current assets R$ 2,298
Total assets 2,298
Current liabilities 121
Total liabilities 121
Net finance income 28,274 (806,760)
Dollar-to-euro swap    
Disclosure of detailed information about financial instruments [line items]    
Current assets 2,298
Total assets 2,298
Current liabilities
Total liabilities
Net finance income (229) (6,467)
Di futuro    
Disclosure of detailed information about financial instruments [line items]    
Current assets
Total assets
Current liabilities 121
Total liabilities 121
Net finance income R$ 28,503 5,829
Forward dollar    
Disclosure of detailed information about financial instruments [line items]    
Current assets  
Total assets  
Current liabilities  
Total liabilities  
Net finance income   (805,760)
Fixed rate-to-CDI interest rate swap    
Disclosure of detailed information about financial instruments [line items]    
Current assets  
Total assets  
Current liabilities  
Total liabilities  
Net finance income   (299)
CDI-to-fixed rate swap    
Disclosure of detailed information about financial instruments [line items]    
Current assets  
Total assets  
Current liabilities  
Total liabilities  
Net finance income   R$ (63)