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TAX CREDITS - Realization of non-current tax credits (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits - non-current | R$ 30,841 | R$ 56,703
Tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits - non-current | 30,841 | 56,703
Tax credits | Year Two |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits - non-current | 18,017 | 33,840
Tax credits | Year Three |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits - non-current | 7,062 | 14,334
Tax credits | After Year Three |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits - non-current | R$ 5,762 |
Tax credits | Year Four |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax credits - non-current |  | R$ 8,529

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