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Equity - Basic earnings (losses) per share (Details) R$ / shares in Units, R$ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2017 | Nov. 30, 2017 | Dec. 31, 2018 BRL (R$) R$ / shares shares | Dec. 31, 2017 BRL (R$) R$ / shares shares | Dec. 31, 2016 BRL (R$) R$ / shares shares
Earnings (losses) per share |  |  |  |  |
Ratio for conversion of preferred shares to common shares | 1 | 1 |  |  |
Basic earnings per share |  |  |  |  |
Earnings attributed to shareholders | R$ |  |  | R$ 319,814 | R$ 1,820,994 | R$ 1,677,815
Weighted average number of shares in the year |  |  | 1,105,826 | 1,106,297 | 1,107,739
Weighted average treasury shares |  |  | (12,333) | (14,597) | (17,696)
Weighted average number of outstanding shares |  |  | 1,093,493 | 1,091,700 | 1,090,043
Total basic earnings (loss) per common share | R$ / shares |  |  | R$ 0.29236 | R$ 1.66804 | R$ 1.53922

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