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12. FINANCIAL INSTRUMENTS (Details 13) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments by type of interest rate [line items]    
Assets R$ 33,435
Liabilities R$ (31,137)
TJLP    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate (in percent) 7.00%  
Assets  
Liabilities (1,003,712)  
TJLP | Probable Scenario    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss [1] (3,202)  
TJLP | Scenario 1    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss (17,565)  
TJLP | Scenario 2    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss R$ (35,130)  
LIBOR    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate (in percent) 1.84%  
Assets  
Liabilities (4,844,015)  
LIBOR | Probable Scenario    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss [1] (44,657)  
LIBOR | Scenario 1    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss (22,247)  
LIBOR | Scenario 2    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss R$ (44,494)  
CDI    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate (in percent) 6.89%  
Assets R$ 644,525  
Liabilities (13,550,383)  
CDI | Probable Scenario    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss [1] (206,061)  
CDI | Scenario 1    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss (222,303)  
CDI | Scenario 2    
Disclosure of financial instruments by type of interest rate [line items]    
Impact on profit or loss R$ (444,606)  
[1] The sensitivity analysis is based on the assumption of maintaining as probable scenario the market rates at December 31, 2017 recorded in the Company's assets and liabilities.