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RELATED-PARTY TRANSACTIONS - Key Management compensation (Details)
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Options
EquityInstruments
Dec. 31, 2017
BRL (R$)
Options
EquityInstruments
Dec. 31, 2016
BRL (R$)
Options
EquityInstruments
Key Management personnel      
RELATED PARTY TRANSACTIONS      
Key management salaries, variable compensation and benefits R$ 50,310,000 R$ 38,510,000  
Contributions to defined contribution pension plans 1,595,000 1,158,000  
Long term incentive plan attributable to key management R$ 23,189,000 R$ 10,451,000 R$ 14,095,000
Stock options      
Number of shares      
Balance, beginning of year | Options 292,391 569,115 1,074,246
Options Cancelled | Options (243,412) (276,724) (505,131)
Balance, end of year | Options 15,480 292,391 569,115
Weighted exercise price      
Beginning of year R$ 17.91 R$ 16.64 R$ 18.36
Options Cancelled 18.62 15.11 20.49
End of year R$ 16.72 R$ 17.91 R$ 16.64
Stock options | Key Management personnel      
Number of shares      
Balance, beginning of year | Options 198,000    
Options Cancelled | Options (198,000)    
Balance, end of year | Options   198,000  
Weighted exercise price      
Beginning of year R$ 18.19    
Options Cancelled R$ 18.62    
End of year   R$ 18.19  
Restricted shares | Key Management personnel      
Restricted shares granted to Management      
Balance, beginning of year | EquityInstruments 5,945,310 4,831,999  
Granted | EquityInstruments 1,255,286 1,353,930  
Exercised | EquityInstruments (511,333) (240,619)  
Shares adjustment | EquityInstruments (313,716)    
Balance, end of year | EquityInstruments 6,375,547 5,945,310 4,831,999