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Capital management (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital management [Abstract]        
Borrowings R$ 0 R$ 205,204    
Cash and cash equivalents (66,767) (79,969) R$ (6,888) R$ (1,199)
Net debt   125,235    
Total equity R$ 870,391 626,862 R$ 461,877 R$ 426,563
Total capital   R$ 752,097    
Gearing ratio   16.65%