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Other Long-Term Liabilities
 9 Months Ended
Sep. 30, 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 September 30, 2021 (in thousands):
December 31, 2020September 30, 2021
Contract liabilities, net of current portion$34,866 $33,201 
Asset retirement obligations7,647 7,944 
Deferred payments related to acquisitions715 — 
Other2,827 2,625 
Other long-term liabilities$46,055 $43,770 
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.