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Other Long-Term Liabilities
 12 Months Ended
Dec. 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 2021 (in thousands):
 December 31, 2020December 31, 2021
Contract liabilities, net of current portion$34,866 $34,704 
Asset retirement obligations7,647 9,122 
Deferred payments related to acquisitions715 — 
Other2,827 3,263 
Other long-term liabilities$46,055 $47,089 
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.
Deferred Payments Related to Acquisitions
In connection with previous acquisitions, the Company acquired certain assets and entered into deferred payment arrangements with the sellers.