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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Foreign Tax Authority | Tax Authority, Spain |  |  |
Debt Instrument [Line Items] |  |  |
Income tax examination, tax payment pending appeal | $ 9,300 |  |
Cash Collateralized Letter Of Credit - Spain Tax Audits | Foreign Tax Authority | Tax Authority, Spain |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount |  | $ 10,700 | $ 11,500
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount |  |  | $ 83,600

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