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Advances to suppliers (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Advances to suppliers    
Advances to suppliers R$ 317,026 R$ 308,054
Current assets 98,533 86,499
Non current assets 218,493 221,555
Forestry Development Program    
Advances to suppliers    
Advances to suppliers 231,063 237,466
Advance for the purchase of finished product    
Advances to suppliers    
Advances to suppliers   33,324
Advance to suppliers    
Advances to suppliers    
Advances to suppliers R$ 85,963 R$ 37,264