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Derivative Instruments - Narrative (Details)
$ in Thousands, R$ in Millions
3 Months Ended 9 Months Ended
Jun. 02, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Nov. 20, 2020
USD ($)
educationalInstitution
derivativeInstrument
R$ / $
Nov. 20, 2020
BRL (R$)
educationalInstitution
derivativeInstrument
R$ / $
Derivative [Line Items]              
Payments on derivatives related to sale of discontinued operations     $ (50,341) $ 0      
Not Designated as Hedging Instrument              
Derivative [Line Items]              
Derivative liability   $ 0 0   $ 25,824    
Not Designated as Hedging Instrument | Currency Swap notional amount              
Derivative [Line Items]              
Unamortized premium           $ 18,294  
Realized loss $ 33,710            
Not Designated as Hedging Instrument | Swap              
Derivative [Line Items]              
Cross currency swaps   0 0   17,680    
Cross currency swaps   0 $ 0   $ 8,144    
Not Designated as Hedging Instrument | Brazil, Brazil Real | Currency Swap notional amount              
Derivative [Line Items]              
Number of currency derivatives held (derivative instrument) | derivativeInstrument           6 6
Derivative notional amount           $ 343,783 R$ 1,875
Derivative, exchange rate | R$ / $           5.4540 5.4540
Payments on derivatives related to sale of discontinued operations   $ 1,663          
Not Designated as Hedging Instrument | Brazil, Brazil Real | Currency Swap, Deal Contingent              
Derivative [Line Items]              
Number of interest rate derivatives held | educationalInstitution           2 2
Not Designated as Hedging Instrument | Brazil, Brazil Real | Cross Currency Interest Rate Contract, Instrument Three and Four              
Derivative [Line Items]              
Derivative notional amount | R$             R$ 1,900
Not Designated as Hedging Instrument | Brazil, Brazil Real | Cross Current Interest Rate Contract, Instrument Four              
Derivative [Line Items]              
Derivative notional amount | R$             950
Not Designated as Hedging Instrument | Brazil, Brazil Real | Cross Current Interest Rate Contract, Instrument Three              
Derivative [Line Items]              
Derivative notional amount | R$             R$ 950
Not Designated as Hedging Instrument | Brazil, Brazil Real | Put/Call Options | Currency Swap notional amount              
Derivative [Line Items]              
Number of interest rate derivatives held | educationalInstitution           4 4