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12. FINANCIAL INSTRUMENTS (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Asset position R$ 33,435
Liability position (31,137)
Fair market value of amounts receivable/(payable) 2,177
Impact on finance income (cost) R$ 28,274 (806,760)
Dollar-to-euro swap    
Disclosure of detailed information about financial instruments [line items]    
Counterparty name BNPP  
Expiration of operation 3/9/2017  
Notional amount 10,250
Asset position 33,435
Liability position (31,137)
Fair market value of amounts receivable/(payable) 2,298
Impact on finance income (cost) R$ (229) (6,467)
Di futuro    
Disclosure of detailed information about financial instruments [line items]    
Counterparty name BM&FBovespa  
Expiration of operation 1/2/2017  
Notional amount 1,641,378
Asset position
Liability position
Fair market value of amounts receivable/(payable) (121)
Impact on finance income (cost) R$ 28,503 R$ 5,829