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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) € in Thousands, $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 11, 2020 EUR (€)
Foreign Tax Authority | Tax Authority, Spain | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Income Tax Examination, Tax Expense Paid, Pending Appeal | $ 9,300 |  |  |
Cash Collateralized Letter Of Credit - Spain Tax Audits |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | $ 11,000 | $ 11,500 |
Cash Collateralized Letter Of Credit - Spain Tax Audits, Extension of Audit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | 25,300 |  | € 21,600
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  | $ 83,600 | $ 83,600 |

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