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LOANS, FINANCING AND DEBENTURES - Fundraising costs (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Cost R$ 723,367  
Amortization 338,325  
Balance to be amortized 385,042 R$ 351,394
Bonds    
Disclosure of detailed information about borrowings [line items]    
Cost 390,104  
Amortization 151,536  
Balance to be amortized 238,568 201,467
CRA and NCE    
Disclosure of detailed information about borrowings [line items]    
Cost 125,222  
Amortization 92,848  
Balance to be amortized 32,374 47,443
Import ("ECA")    
Disclosure of detailed information about borrowings [line items]    
Cost 102,769  
Amortization 46,741  
Balance to be amortized 56,028 40,382
Debentures    
Disclosure of detailed information about borrowings [line items]    
Cost 24,467  
Amortization 8,428  
Balance to be amortized 16,039 19,065
BNDES ("IOF")    
Disclosure of detailed information about borrowings [line items]    
Cost 62,658  
Amortization 22,047  
Balance to be amortized 40,611 38,447
Others    
Disclosure of detailed information about borrowings [line items]    
Cost 18,147  
Amortization 16,725  
Balance to be amortized R$ 1,422 R$ 4,590