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5. Risk Management (Details)
¥ in Thousands, R$ in Thousands, $ in Thousands
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
JPY (¥)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
JPY (¥)
SummaryOfRiskManagementLineItems [Line Items]            
Borrowings and financing - US R$ 3,972,200     R$ 4,047,682    
Borrowings and financing - Yen 1,692,713     1,609,419    
Interest and charges from borrowings and financing - US$ 26,628     25,114    
Interest and charges from borrowings and financing - Yen 10,834     10,769    
Total exposure 5,702,375     5,692,984    
Borrowing cost - US (26,454)     (29,650)    
Borrowing cost - Yen (3,100)     (2,971)    
Total foreign currency-denominated borrowings R$ 5,672,821     R$ 5,660,363    
Foreign currency            
SummaryOfRiskManagementLineItems [Line Items]            
Borrowings and financing - US | $   $ 1,200,786     $ 1,241,963  
Borrowings and financing - Yen | ¥     ¥ 57,575,271     ¥ 57,643,930