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12. FINANCIAL INSTRUMENTS (Details 8) - 12 months ended Dec. 31, 2017
€ in Thousands, R$ in Thousands, $ in Thousands
BRL (R$)
USD ($)
R$ / $
EUR (€)
R$ / $
Disclosure of detailed information about hedged items [line items]      
Designated amounts   $ 1,566,000  
Amortized part   $ (248,333)  
Impact on Shareholders' equity | R$ R$ (395,524)    
Foreign Subsidiaries      
Disclosure of detailed information about hedged items [line items]      
Designation date 09/01/2015    
Hedging instrument Non-derivative financial liabilities in EUR – Debt contract    
Hedged item Investments in subsidiaries which EUR is the functional currency    
Type of hedged risk Foreign exchange - R$ vs. EUR spot rate    
Exchange rate on designation | R$ / $   4.0825 4.0825
Designated amounts | €     € 120,000
Amortized part   $ (48,000)  
Impact on Shareholders' equity | R$ R$ (17,911)