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Cash and Cash Equivalents (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents        
Cash and banks R$ 1,151,766 R$ 602,728    
Financial investments 3,235,687 474,105    
Total cash and cash equivalents R$ 4,387,453 R$ 1,076,833 R$ 1,614,697 R$ 1,477,246
CDI | Financial investments        
Cash and cash equivalents        
Percentage of basis used to calculate interest rate 99.46% 110.60%    
Domestic        
Cash and cash equivalents        
Cash and banks R$ 28,233 R$ 19,124    
Financial investments 3,215,252 472,168    
Foreign        
Cash and cash equivalents        
Cash and banks 1,123,533 583,604    
Financial investments R$ 20,435 R$ 1,937