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Income tax and social contribution (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets and liabilities    
Assets R$ 37,015 R$ 8,305
Liabilities (42,809) (24,378)
2017    
Deferred tax assets and liabilities    
Assets   940
Liabilities   (8,126)
2018    
Deferred tax assets and liabilities    
Assets 8,895 940
Liabilities (20,728) (8,126)
2019    
Deferred tax assets and liabilities    
Assets 4,040 940
Liabilities (18,008) (8,126)
2020    
Deferred tax assets and liabilities    
Assets 2,111 940
Liabilities (2,454)  
2021    
Deferred tax assets and liabilities    
Assets 982 R$ 4,545
Liabilities (1,434)  
2022    
Deferred tax assets and liabilities    
Assets 20,987  
Liabilities R$ (185)