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Equity - Allocation of net income and dividends (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Equity    
Net income (loss) under statutory book for the year R$ 318,339 R$ 1,807,433
Accrual of Legal reserve - 5% (15,917) (90,372)
Accrual of reserve for tax incentives (288,557) (196,604)
Dividend distribution base 13,865 1,520,457
Minimum mandatory dividends - 25% 3,466 380,115
Dividends paid in advance as interest on own capital   (199,835)
Minimum mandatory dividends payable   R$ 180,280
Total dividends submitted to approval R$ 600,000