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Derivative Instruments (Narrative) (Details) $ in Thousands, BRL in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Aug. 11, 2016 USD ($) | Jul. 15, 2016 USD ($) | Jun. 24, 2016 USD ($) | Mar. 29, 2016 BRL instrument | Mar. 29, 2016 USD ($) instrument | Nov. 13, 2015 BRL | Nov. 13, 2015 USD ($) | Nov. 07, 2013 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest |  | $ 76,605 | $ 64,229 | $ 71,369 |  |  |  |  |  |  |  |
Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net collections (payments) to derivative instrument hedges |  | (1,307) | 2,306 | 1,451 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal and interest collections hedged (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 53.08%
Interest rate of derivative instrument (as a percent) |  |  |  |  |  |  |  |  |  | 4.38% | 4.38% |
Notional amount of derivative |  |  |  |  | $ 32,400 | $ 30,700 | $ 28,300 |  |  | BRL 108.0 | $ 33,200 | $ 47,300
Payments for derivative instrument |  | 6,268 |  |  |  |  |  |  |  |  |  |
Proceeds from amendment of derivative instrument agreement |  |  | 19,817 |  |  |  |  |  |  |  |  |
Loss on amendment to derivative instrument agreement |  |  | 2,650 |  |  |  |  |  |  |  |  |
Deferred amount in accumulated other comprehensive income |  | 658 |  |  |  |  |  |  |  |  |  |
Interest |  | 2,795 | 1,933 | 3,512 |  |  |  |  |  |  |  |
Brazil Real [Member] | JP Morgan Chase Bank, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of derivative instrument (as a percent) |  |  |  |  |  |  |  |  |  | 13.00% | 13.00% |
Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount outstanding |  | 12,295 |  |  |  |  |  |  |  |  |  |
Subsidiaries [Member] | Secured Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | 6,519 | $ 0 | $ 0 |  |  |  |  |  |  |  |
Subsidiaries [Member] | Secured Loan Agreement [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  |  |  | BRL 613.9 | $ 167,300 |  |  |
Number of instruments held | instrument |  |  |  |  |  |  |  | 5 | 5 |  |  |
Loss on derivative |  | 18,177 |  |  |  |  |  |  |  |  |  |
Interest expense |  | $ 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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