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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) € in Thousands | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 11, 2020 EUR (€)
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Surety Bond |  |  |
Debt Instrument [Line Items] |  |  |
Guarantee amount, maximum potential amount of payments | $ 17,046,000 | $ 17,094,000 |
Cash Collateralized Letter Of Credit - Spain Tax Audits |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount | 11,300,000 | 11,500,000 |
Cash Collateralized Letter Of Credit - Spain Tax Audits, Extension of Audit |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount | 25,800,000 |  | € 21,600
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount | $ 83,600,000 | $ 83,600,000 |

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