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EQUITY - Dividends and interest on capital (Details) - BRL (R$) R$ / shares in Units, shares in Thousands, R$ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual mandatory dividend (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |
Related tax benefit arising from the recording of interest on shareholders' capital as financial expense for tax purposes |  |  |  |  |  |  |  |  |  |  |  | R$ 0 | R$ 127,311 |
Appropriation of retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to owners of parent |  |  |  |  |  |  |  |  |  |  |  | 1,203,736 | 2,303,868 | R$ (359,360)
Dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  | R$ (370,167) | (770,363) |
Dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on capital paid (in R$/share) |  | R$ 0.04 |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid (in R$/share) | R$ 0.03 |  | R$ 0.07 | R$ 0.07 |  |  |  |  |  |  |  | R$ 0.03 |  |
Outstanding shares | 1,698,941 | 1,698,774 | 1,697,390 | 1,697,180 |  |  |  |  |  |  |  | 1,698,941 |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Appropriation of retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to owners of parent |  |  |  |  |  |  |  |  |  |  |  | R$ 1,203,736 | 2,303,868 | (359,360)
Constitution of legal reserve |  |  |  |  |  |  |  |  |  |  |  | (55,876) | (115,193) |
Constitution of the tax incentives reserve |  |  |  |  |  |  |  |  |  |  |  | (86,216) | (17,051) |
Net income (loss) before dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  | 1,061,644 | 2,171,624 | (359,360)
Dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  | (356,539) | (765,339) |
Net income (loss) before constitution of investments and working capital reserve |  |  |  |  |  |  |  |  |  |  |  | 705,105 | 1,406,285 | (359,360)
Constitution of investments and working capital reserve |  |  |  |  |  |  |  |  |  |  |  | (705,105) | (1,406,285) |
Absorption of net loss by investments and working capital reserve |  |  |  |  |  |  |  |  |  |  |  |  |  | 359,360
Total Parent company's interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Appropriation of retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  | (356,539) | (765,339) |
Dividends and interest on capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  | R$ 67,951 |  |  |  | R$ 221,278 | R$ 238,293 | R$ 136,152 |  | R$ 51,278 |  |  |  |
Dividends | R$ 50,968 |  | R$ 118,817 | R$ 118,803 | R$ 169,616 |  |  |  | R$ 51,020 |  | R$ 34,184 |  |  |
Interest and Dividends |  |  |  |  |  |  |  |  |  |  |  | R$ 356,539 | R$ 765,339 | R$ 136,482
Credit per share (R$) |  |  |  |  |  |  |  |  |  |  |  | R$ 0.21 | R$ 0.45 | R$ 0.08

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