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INCOME AND SOCIAL CONTRIBUTION TAXES - Estimated recovery and reversal of income and social contributions tax assets and liabilities (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets R$ 3,393,354 R$ 4,071,219 R$ 3,874,054 R$ 3,054,393
Non-current liabilities (61,562) (517,413) R$ (118,368) R$ (82,686)
2020        
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets   605,657    
2021        
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets 616,409 467,153    
Non-current liabilities (8,558) (98,449)    
2022        
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets 399,248 422,863    
Non-current liabilities (8,192) (110,031)    
2023        
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets 391,610 464,514    
Non-current liabilities (14,815) (90,703)    
2024        
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets 348,139 472,734    
Non-current liabilities (3,145) (79,022)    
2025 and after        
Deferred income and social contribution tax assets and liabilities at statutory tax rates        
Non-current assets 1,637,948 1,638,298    
Non-current liabilities R$ (26,852) R$ (139,208)