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Other Long-Term Liabilities
 12 Months Ended
Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities Other Long-Term Liabilities
Other long-term liabilities consist of the following as of December 31, 2019 and 2020 (in thousands):
 December 31, 2019December 31, 2020
Contract liabilities, net of current portion$30,925 $34,866 
Asset retirement obligations1,961 7,647 
Deferred payments related to acquisitions4,963 715 
Employee separation costs1,838 — 
Other1,764 2,827 
Other long-term liabilities$41,451 $46,055 
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. As of December 31, 2020, approximately $5.8 million relates to asset retirement obligation assumed in the ANZ acquisition.
Deferred Payments Related to Acquisitions
In connection with previous acquisitions, the Company acquired certain assets and entered into deferred payment arrangements with the sellers. The deferred payment arrangements are valued at approximately $2.2 million and $0.7 million as of December 31, 2019 and 2020, respectively. In addition, one of the sellers contributed $2.8 million to the Company representing the seller’s continuing interest in the assets acquired. The seller's continuing interest terminated following the final one-time cash payment that the Company made related to the JWMI perpetual license agreement (as discussed in Note 11).
Employee Separation Costs
Severance and other employee separation costs to be paid after one year.