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21. PAYMENT TO SHAREHOLDERS (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Payment To Shareholders Details Abstract      
Profit for the year R$ 5,074,136 R$ 10,272 R$ (934,747)
Absorption of deficits (1,291,689)    
Legal reserve (189,122)    
Allocation of profits 3,593,325    
Proposed destination:      
Mandatory minimum dividends (898,332)    
Intended for statutory reserve of working capital (2,694,993)    
In current liabilities      
Dividends to be paid on December 31, 2017 2,209    
Mandatory minimum dividends 898,332    
Dividends to be paid on December 31, 2018 R$ 900,541 R$ 2,209  
Weighted average number of shares 1,373,251    
Dividends per share approved R$ 0.65416