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Accounts Payable and Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2019
Payables and Accruals [Abstract] |
Schedule of Accounts Payables and Accrued Expenses | Accounts payable and accrued expenses consist of the following as of December 31, 2018 and 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2018 |  | 2019
Trade payables | ​ | $ | 36,566 | ​ | $ | 47,503
Accrued compensation and benefits | ​ |  | 35,844 | ​ |  | 33,924
Accrued student obligations | ​ |  | 4,284 | ​ |  | 4,580
Real estate liabilities | ​ |  | 5,156 | ​ |  | 751
Other | ​ |  | 4,129 | ​ |  | 4,070
Accounts payable and accrued liabilities | ​ | $ | 85,979 | ​ | $ | 90,828

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