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Significant Accounting Policies - Tuition Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |  |  |  |
Tuition receivable | $ 79,429 |  | $ 82,454 |  |
Allowance for credit losses | (38,094) |  | (30,931) | $ (29,387) | $ (28,457)
Tuition receivable, net | $ 41,335 | $ 51,523 | $ 51,523 |  |

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