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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) € in Thousands | Mar. 31, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Nov. 30, 2016 USD ($)
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Surety Bond |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Guarantee amount, maximum potential amount of payments | $ 26,069,000 |  | $ 25,852,000 |  |
Cash Collateralized Letter Of Credit - Spain Tax Audits |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding, amount | 10,500,000 | € 9,443 | 5,500,000 | € 5,036 |
Non-Collateralized Surety Bond - UAM Brazil | Surety Bond |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Guarantee amount, maximum potential amount of payments |  |  |  |  | $ 15,300,000
Cost of surety bond |  |  |  |  | $ 1,400,000
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding, amount | $ 125,800,000 |  | $ 127,300,000 |  |

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