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Derivative Instruments (Cross-currency Interest Rate Swap) (Details) - Cross-Currency Interest Rate Swaps [Member]
R$ in Thousands, $ in Thousands
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Cross-Currency Interest Rate Swap Originated November 2013 [Member] | JPMorgan Chase Bank N.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 108,000  
Cross-Currency Interest Rate Swap Originated November 2013 [Member] | JPMorgan Chase Bank N.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 35,400
Interest rate (as a percent) 4.38% 4.38%
Cross-Currency Interest Rate Swap Originated November 2013 [Member] | Brazil Real [Member] | JPMorgan Chase Bank N.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 13.00% 13.00%
Cross-Currency Interest Rate Swap Originated June 2017 [Member] | JPMorgan Chase Bank N.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 98,670  
Cross-Currency Interest Rate Swap Originated June 2017 [Member] | JPMorgan Chase Bank N.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 30,000
Interest rate (as a percent) 6.02% 6.02%
Cross-Currency Interest Rate Swap Originated June 2017 [Member] | Brazil Real [Member] | JPMorgan Chase Bank N.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 13.00% 13.00%
Cross-Currency Interest Rate Swap Originated July 2017 [Member] | Citibank N.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 94,200  
Cross-Currency Interest Rate Swap Originated July 2017 [Member] | Citibank N.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 30,000
Interest rate (as a percent) 6.29% 6.29%
Cross-Currency Interest Rate Swap Originated July 2017 [Member] | Brazil Real [Member] | Citibank N.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 13.00% 13.00%
Subsidiaries [Member] | Banco Santander S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 155,500  
Subsidiaries [Member] | Banco Santander S.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 50,000
Interest rate (as a percent) 6.91% 6.91%
Subsidiaries [Member] | Brazil Real [Member] | Banco Santander S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 13.77% 13.77%
Subsidiaries [Member] | Cross-Currency Interest Rate Swap Originated November 2013 [Member] | Bank of America Merrill Lynch Banco Multiplo S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Notional Amount | R$ R$ 156,250  
Subsidiaries [Member] | Cross-Currency Interest Rate Swap Originated November 2013 [Member] | Bank of America Merrill Lynch Banco Multiplo S.A. [Member] | Receivable [Member]    
Derivative [Line Items]    
Notional Amount | $   $ 50,000
Interest rate (as a percent) 6.91% 6.91%
Subsidiaries [Member] | Cross-Currency Interest Rate Swap Originated November 2013 [Member] | Brazil Real [Member] | Bank of America Merrill Lynch Banco Multiplo S.A. [Member] | Payable [Member]    
Derivative [Line Items]    
Interest rate (as a percent) 13.64% 13.64%