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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
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