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Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) - Derivatives Not Designated As Hedging Instruments: R$ in Millions |  |  |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Jun. 04, 2019 USD ($) $ / € | May 15, 2019 USD ($) | Apr. 02, 2019 USD ($) | Jan. 16, 2018 USD ($) | Jun. 15, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / € | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / € | Dec. 31, 2019 USD ($) swapAgreement $ / € | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) $ / € | Nov. 20, 2020 USD ($) educationalInstitution derivativeInstrument R$ / $ | Nov. 20, 2020 BRL (R$) educationalInstitution derivativeInstrument R$ / $ | Sep. 30, 2020 MXN ($) swapAgreement | Sep. 30, 2020 AUD ($) swapAgreement | Apr. 08, 2020 USD ($) $ / € | Apr. 08, 2020 EUR (€) $ / € | Dec. 31, 2019 EUR (€) swapAgreement $ / € | May 31, 2019 USD ($) $ / € | May 31, 2019 EUR (€) $ / € | May 01, 2019 swapAgreement | Apr. 30, 2019 EUR (€) swapAgreement | Dec. 31, 2018 EUR (€) swapAgreement | Apr. 23, 2018 USD ($) | Dec. 31, 2011 USD ($) swapAgreement
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  |  |  | $ (25,980,000) | $ 8,300,000 | $ 88,476,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross Currency Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  | 9 |  |  |  |
Derivative liability, current |  |  |  |  |  | $ 17,680,000 |  | 17,680,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability, noncurrent |  |  |  |  |  | 8,144,000 |  | 8,144,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Exchange Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Derivative, notional amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 200,000,000 |  |
Unrealized gain on derivatives |  |  |  | $ 9,960,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent redemption features - Series A Preferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  |  |  | 0 | 0 | $ 98,180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,300,000 |
Probability of conversion of convertible security |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Euro Member Countries, Euro | Cross Currency Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Derivative, notional amount | $ 597,149,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 423,003,000 | € 532,000,000 |  | € 375,000,000 |  |  |
Derivative, swap type, variable price | $ / € | 1.122461 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.128007 | 1.128007 |  |  |  |  |
Unrealized gain on derivatives | $ 565,000 | $ (1,644,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Member Countries, Euro | Swap 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  | $ 314,573,000 |  |  |  |  |  |  |  |  | € 275,000,000 |  |  |  |  |  |  |
Derivative, swap type, variable price | $ / € |  |  |  |  |  |  |  |  | 1.1439 |  |  |  |  |  |  |  |  | 1.1439 |  |  |  |  |  |  |
Unrealized gain on derivatives |  |  | $ (5,088,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Member Countries, Euro | Cross Currency Interest Rate Contract, Maturing April 8, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  | $ 310,750,000 |  |  |  |  |  |  |  |  | € 275,000,000 |  |  |  |  |  |  |
Derivative, swap type, variable price | $ / € |  |  |  |  |  |  |  |  | 1.13 |  |  |  |  |  |  |  |  | 1.13 |  |  |  |  |  |  |
Derivative, cost of hedge |  |  | $ 980,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chile, Pesos | Cross Currency Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,000
Derivative, cost of hedge |  |  |  |  |  |  | $ 8,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, number of instruments held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4
Chile, Pesos | Cross Currency Interest Rate Contract, Maturing December 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, number of instruments held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Chile, Pesos | Cross Currency Interest Rate Contract, Maturing July 1, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, number of instruments held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Mexico, Pesos | Cross Currency Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 23,000,000 |  | $ 23,000,000 |  |  |  |  |  | $ 453,146,000 |  |  |  |  |  |  |  |  |  |  |
Derivative, swap type, variable price |  |  |  |  |  | 0.0508 |  | 0.0508 |  |  | 0.0508 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  | $ (583,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia, Dollars | Cross Currency Swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | swapAgreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | 7,443,000 |  | $ 7,443,000 |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |
Derivative, swap type, variable price |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.6766 | 0.6766 |  |  |  |  |  |  |  |  |  |
Realized gain (loss) |  |  |  |  |  | 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Australia, Dollars | Net investment cross currency swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 13,713,000 |  | $ 13,713,000 |  |  | € 21,000,000 |  |  |  |  | $ 12,921,000 | € 21,000 |  |  |  |  |  |  |  |
Derivative, swap type, variable price | $ / € |  |  |  |  |  | 0.6530 |  | 0.6530 |  |  | 0.6530 |  |  |  |  | 0.6153 | 0.6153 |  |  |  |  |  |  |  |
Unrealized gain on derivatives |  |  |  |  | $ 1,340,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brazil, Brazil Real | Net investment cross currency swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of currency derivatives held (derivative instrument) | derivativeInstrument |  |  |  |  |  |  |  |  |  |  |  | 6 | 6 |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 343,783,000 | R$ 1,875 |  |  |  |  |  |  |  |  |  |  |  |
Derivative, swap type, variable price | R$ / $ |  |  |  |  |  |  |  |  |  |  |  | 5.4540 | 5.4540 |  |  |  |  |  |  |  |  |  |  |  |
Brazil, Brazil Real | Net investment cross currency swaps | Put/Call Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate derivatives held (derivative instrument) | educationalInstitution |  |  |  |  |  |  |  |  |  |  |  | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |
Brazil, Brazil Real | Currency Swap, Deal Contingent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate derivatives held (derivative instrument) | educationalInstitution |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |

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