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FINANCIAL INSTRUMENTS - Swap Contracts (Details)
R$ in Thousands, $ in Millions
Dec. 31, 2018
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Swap Contracts        
Notional value   R$ 13,178,457   R$ 16,207,120
Assets, Fair value        
Swap Contracts        
Amount receivable   33,417    
Amount payable   (5,245)   (1,267)
Forward contract | Forward contracts maturing at 2019 long position        
Swap Contracts        
Notional value | $ $ 19.2      
Amount payable   (4,069)    
Forward contract | Forward contracts maturing at 2019 short position        
Swap Contracts        
Notional value | $ $ 18.3      
Amount receivable   462    
Amount payable   R$ (1,176)    
Currency swap | Currency swap maturing in 2018        
Swap Contracts        
Notional value | $     $ 40.0  
Amount payable       R$ (1,267)
Currency swap | Currency swap maturing in 2018 | INR        
Swap Contracts        
Fixed interest rate (as a percent) 10.17% 10.17% 10.17% 10.17%
Currency swap | Currency swap maturing in 2019        
Swap Contracts        
Notional value   R$ 230,500    
Amount receivable   R$ 30,249    
Currency swap | Currency swap maturing in 2019 | CDI        
Swap Contracts        
Floating interest rate (as a percent) 111.50% 111.50% 111.50% 111.50%
Interest Rate Swap | Interest rate swap maturing in 2020        
Swap Contracts        
Notional value   R$ 50,000    
Amount receivable   R$ 2,706    
Interest Rate Swap | Interest rate swap maturing in 2020 | CDI        
Swap Contracts        
Floating interest rate (as a percent) 111.50% 111.50% 111.50% 111.50%