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12. FINANCIAL INSTRUMENTS (Details 11)
Dec. 31, 2017
CDI  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 6.89%
CDI | Scenario 1  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 8.61%
CDI | Scenario 2  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 10.34%
TJLP  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 7.00%
TJLP | Scenario 1  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 8.75%
TJLP | Scenario 2  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 10.50%
LIBOR  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 1.84%
LIBOR | Scenario 1  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 2.30%
LIBOR | Scenario 2  
Disclosure of financial instruments by type of interest rate [line items]  
Interest rate (in percent) 2.76%