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Other Long-Term Liabilities | 3 Months Ended
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Mar. 31, 2021
Other Liabilities, Noncurrent [Abstract] |
Other Long-Term Liabilities | Other Long-Term Liabilities Other long-term liabilities consist of the following as of December 31, 2020 and March 31, 2021 (in thousands):
| December 31, 2020 |  | March 31, 2021
Contract liabilities, net of current portion | $ | 34,866 |  |  | $ | 33,217 |
Asset retirement obligations | 7,647 |  |  | 8,623 |
Deferred payments related to acquisitions | 715 |  |  | — |
Other | 2,827 |  |  | 2,877 |
Other long-term liabilities | $ | 46,055 |  |  | $ | 44,717 |
Contract Liabilities As discussed in Note 4, in connection with its student tuition contracts, the Company has an obligation to provide free classes in the future should certain eligibility conditions be maintained (the Graduation Fund). Long-term contract liabilities represent the amount of revenue under these arrangements that the Company expects will be realized after one year. Asset Retirement Obligations Certain of the Company's lease agreements require the leased premises to be returned in a predetermined condition. As of December 31, 2020 and March 31, 2021, approximately $5.8 million and $6.9 million, respectively, relate to asset retirement obligations for the Company's Australia and New Zealand leases. Deferred Payments Related to Acquisitions In connection with previous acquisitions, the Company acquired certain assets and entered into deferred payment arrangements with the sellers.

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