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Other Assets - Schedule of Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]            
Prepaid expenses, net of current portion $ 17,321   $ 18,192      
Equity method investments 16,175 $ 17,205 13,879 $ 13,979 $ 14,011 $ 15,582
Cloud computing arrangements, net of current portion 12,021   7,507      
Other investments 2,806   3,396      
Tuition receivable, net, non-current 2,559   2,673      
Other 4,063   4,005      
Other assets $ 54,945   $ 49,652