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18. Deferred taxes and contributions (Details 3) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Taxes And Contributions Details 3 |  |  |
Deferred tax assets, net, beginning | R$ 186,345 | R$ 128,242 | R$ 209,478
Net change in the year - corresponding entry to the income statement | (101,517) | (60,667) | (50,024)
Net change in the year - corresponding entry to valuation adjustments to equity (Note 20 (b)) | (121,582) | 118,770 | (31,212)
Total net change | (223,099) | 58,103 | (81,236)
Deferred tax assets, net, ending | R$ (36,754) | R$ 186,345 | R$ 128,242

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