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Other Long-Term Liabilities | 12 Months Ended
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Dec. 31, 2022
Other Liabilities, Noncurrent [Abstract] |
Other Long-Term Liabilities | Other Long-Term Liabilities Other long-term liabilities consist of the following as of December 31, 2021 and 2022 (in thousands):
| December 31, 2021 |  | December 31, 2022
Contract liabilities, net of current portion | $ | 34,704 |  |  | $ | 36,540 |
Asset retirement obligations | 9,122 |  |  | 6,283 |
Other | 3,263 |  |  | 3,183 |
Other long-term liabilities | $ | 47,089 |  |  | $ | 46,006 |
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.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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