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Other Long-Term Liabilities
 6 Months Ended
Jun. 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 June 30, 2021 (in thousands):
December 31, 2020June 30, 2021
Contract liabilities, net of current portion$34,866 $33,676 
Asset retirement obligations7,647 8,651 
Deferred payments related to acquisitions715 — 
Other2,827 2,677 
Other long-term liabilities$46,055 $45,004 
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.