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Other Long-Term Liabilities
 12 Months Ended
Dec. 31, 2023
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities Other Long-Term Liabilities
Other long-term liabilities consist of the following as of December 31, 2022 and 2023 (in thousands):
 December 31, 2022December 31, 2023
Contract liabilities, net of current portion$36,540 $37,188 
Asset retirement obligations6,283 5,225 
Other3,183 3,190 
Other long-term liabilities$46,006 $45,603 
Contract Liabilities
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. 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.