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Significant Accounting Policies - Tuition Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Schedule of tuition receivable and allowance for doubtful accounts |  |  |  |
Tuition receivable | $ 82,454 | $ 84,151 |  |
Allowance for doubtful accounts | (30,931) | (28,457) | $ (12,687) | $ (10,201)
Tuition receivable, net | 51,523 | 55,694 |  |
Other assets |  |  |  |
Schedule of tuition receivable and allowance for doubtful accounts |  |  |  |
Tuition receivable, noncurrent | $ 1,000 | $ 1,100 |  |

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