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Derivative Instruments (Narrative) (Details) $ in Thousands, R$ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2017 BRL (R$) instrument | Apr. 30, 2017 USD ($) instrument | Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jul. 31, 2017 instrument | Mar. 29, 2016 BRL (R$) instrument | Mar. 29, 2016 USD ($) instrument
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Interest |  |  |  | $ 53,206 | $ 76,605 | $ 64,229 |  |  |
Forward Contracts [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Net collections (payments) to derivative instrument hedges |  |  |  | (1,236) | (1,307) | 2,306 |  |  |
Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of instruments held | instrument |  |  |  |  |  |  | 3 |  |
Percentage of principal and interest collections hedged (as a percent) |  |  |  |  |  |  | 73.00% |  |
Interest |  |  |  | 6,163 | 2,795 |  |  |  |
Call Spread [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of instruments held | instrument | 2 | 2 |  |  |  |  |  |  |
Coupon-only Swap [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Interest |  |  |  | 1,390 |  |  |  |  |
Total Equity Return Swap [Member] | Class A Shares Of Common Stock [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Settlement payment for share reductions |  |  | $ 9,681 |  |  |  |  |  |
JP Morgan Chase Bank, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Payments for derivative instrument |  |  |  | 2,689 |  |  |  |  |
Deferred amount in accumulated other comprehensive income |  |  |  | 677 |  |  |  |  |
Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount outstanding |  |  |  | 24,397 |  |  |  |  |
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Payments for derivative instrument |  |  |  | 1,156 |  |  |  |  |
Subsidiaries [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Percentage of principal and interest collections hedged (as a percent) | 50.00% | 50.00% |  |  |  |  |  |  |
Subsidiaries [Member] | Call Spread [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Percentage of principal and interest collections hedged (as a percent) | 50.00% | 50.00% |  |  |  |  |  |  |
Subsidiaries [Member] | Coupon-only Swap [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Percentage of principal and interest collections hedged (as a percent) | 50.00% | 50.00% |  |  |  |  |  |  |
Subsidiaries [Member] | Secured Loan Agreement [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Loss on derivative |  |  |  | 2,570 | 6,519 |  |  |  |
Interest expense |  |  |  | 2,570 | 6,519 | $ 0 |  |  |
Subsidiaries [Member] | Secured Loan Agreement [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Number of instruments held | instrument |  |  |  |  |  |  |  | 5 | 5
Interest |  | $ 900 |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  |  |  | R$ 613.9 | $ 167,300
Payments for derivative instrument | R$ 122.7 | $ 39,100 |  |  |  |  |  |  |
Accrued interest |  |  |  | 6,921 | 18,177 |  |  |  |
Loss on derivative |  |  |  | 6,921 | 18,177 |  |  |  |
Interest expense |  |  |  | $ 9,491 | $ 24,696 |  |  |  |
Subsidiaries [Member] | CDI [Member] | Secured Loan Agreement [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Basis point spread on variable rate (as a percent) |  |  |  |  |  |  |  | 4.50% | 4.50%

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