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Derivative Instruments (Coupon-only Swap) (Details) - Subsidiaries [Member] - Coupon-only Swap [Member]
R$ in Thousands, $ in Thousands
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Citibank S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 155,500  
Citibank S.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 50,000
Interest rate (as a percent) 6.91% 6.91%
JP Morgan S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 156,250  
JP Morgan S.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 50,000
Interest rate (as a percent) 6.91% 6.91%
Brazil Real [Member] | Citibank S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 11.08% 11.08%
Brazil Real [Member] | JP Morgan S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 11.18% 11.18%