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15. Property, plant and equipment (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost R$ 538,687 R$ 544,693    
Accumulated amortization (283,637) (242,310)    
Net 255,050 302,383 R$ 325,076 R$ 304,845
Land        
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost 92,507 92,494    
Accumulated amortization 0 0    
Net 92,507 92,494 102,708 100,533
Buildings        
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost 79,013 77,548    
Accumulated amortization (36,653) (34,286)    
Net 42,360 43,262 45,891 42,515
Equipment        
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost 330,753 338,696    
Accumulated amortization (226,950) (189,556)    
Net 103,803 149,140 162,218 146,922
Transportation        
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost 10,862 11,141    
Accumulated amortization (7,182) (6,610)    
Net 3,680 4,531 5,692 7,613
Furniture and fixtures        
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost 24,430 23,633    
Accumulated amortization (12,614) (11,647)    
Net 11,816 11,986 8,418 7,124
Other        
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items]        
Cost 1,122 1,181    
Accumulated amortization (238) (211)    
Net R$ 884 R$ 970 R$ 149 R$ 138