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Other Long-Term Liabilities
 6 Months Ended
Jun. 30, 2025
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities Other Long-Term Liabilities
Other long-term liabilities consist of the following as of December 31, 2024 and June 30, 2025 (in thousands):
December 31, 2024June 30, 2025
Contract liabilities, net of current portion$34,505 $36,070 
Asset retirement obligations3,876 4,059 
Other1,805 2,082 
Other long-term liabilities$40,186 $42,211 
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.