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5. Risk Management (Details)
¥ in Thousands, R$ in Thousands, $ in Thousands
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JPY (¥)
SummaryOfRiskManagementLineItems [Line Items]            
Borrowings and financing - US$ R$ 4,615,476     R$ 3,972,200    
Borrowings and financing - Yen 2,026,726     1,692,713    
Interest and charges from borrowings and financing - US$ 40,193     26,628    
Interest and charges from borrowings and financing - Yen 12,517     10,834    
Total exposure 6,694,912     5,702,375    
Borrowing cost - US$ (22,390)     (26,454)    
Borrowing cost - Yen (3,113)     (3,100)    
Total foreign currency-denominated borrowings R$ 6,669,409     R$ 5,672,821    
Foreign currency            
SummaryOfRiskManagementLineItems [Line Items]            
Borrowings and financing - US$ | $   $ 1,191,152     $ 1,200,786  
Borrowings and financing - Yen | ¥     ¥ 57,463,173     ¥ 57,575,271