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13. Taxes (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Taxes Details 6Abstract      
Income before IRPJ and CSLL R$ 1,955,997 R$ 1,392,941 R$ 1,394,162
IRPJ and CSLL (34%) (665,039) (473,600) (474,015)
Tax effects on:      
Equity in income 46,203 36,555 66,899
Interest on own capital 98,917 90,440 96,202
Dividends 280 497 838
Non deductible expenses (9,322) (26,292) (11,624)
Tax incentives 16,465 14,973 16,567
Unrecognized income and social contribution tax loss carry-forwards (15,383) (5,645) 0
Setting up and/or offset of income tax and social contribution losses of prior years 5,037 90,804 0
Difference between the calculation bases of deemed profit and taxable profit 11,076 (19,680) (114,149)
Others (227) 17,262 (100,408)
Current IRPJ and CSLL (580,065) (379,943) (589,322)
Deferred IRPJ and CSLL R$ 68,072 R$ 105,257 R$ 69,632
Effective rate - % 26.20% 19.70% 37.30%