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LOANS, FINANCING AND DEBENTURES - Fundraising costs (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Cost R$ 736,918  
Amortization 364,582  
Balance to be amortized 351,394 R$ 156,303
Bonds    
Disclosure of detailed information about borrowings [line items]    
Cost 343,642  
Amortization 129,297  
Balance to be amortized 201,467 67,189
CRA and NCE    
Disclosure of detailed information about borrowings [line items]    
Cost 125,222  
Amortization 73,508  
Balance to be amortized 47,443 20,195
Import ("ECA")    
Disclosure of detailed information about borrowings [line items]    
Cost 101,811  
Amortization 101,811  
Balance to be amortized   16,235
Syndicated Loan    
Disclosure of detailed information about borrowings [line items]    
Cost 72,774  
Amortization 33,209  
Balance to be amortized 40,382 30,552
Debentures    
Disclosure of detailed information about borrowings [line items]    
Cost 21,592  
Amortization 4,674  
Balance to be amortized 19,065 18,944
BNDES ("IOF")    
Disclosure of detailed information about borrowings [line items]    
Cost 53,730  
Amortization 13,702  
Balance to be amortized 38,447  
Others    
Disclosure of detailed information about borrowings [line items]    
Cost 18,147  
Amortization 8,381  
Balance to be amortized R$ 4,590 R$ 3,188