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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$) | Dec. 31, 2017 USD ($)
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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%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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