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13. FINANCIAL INSTRUMENTS (Details 13)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
TJLP  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 6.98%
TJLP | Probable Scenario  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss R$ (2,793)
TJLP | Scenario 1  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss (16,658)
TJLP | Scenario 2  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss R$ (33,316)
LIBOR  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 2.88%
LIBOR | Probable Scenario  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss R$ (47,391)
LIBOR | Scenario 1  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss (34,505)
LIBOR | Scenario 2  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss R$ (69,010)
CDI  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 6.40%
CDI | Probable Scenario  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss R$ (53,528)
CDI | Scenario 1  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss (176,924)
CDI | Scenario 2  
Disclosure of financial instruments by type of interest rate [line items]  
Impact on profit or loss R$ (353,848)