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Revenue Recognition - Schedule of Graduation Fund liability (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Graduation Fund [Roll Forward]    
Balance at beginning of period $ 44,480 $ 46,842
Revenue deferred 9,431 9,875
Benefit redeemed (11,358) (11,391)
Balance at end of period $ 42,553 $ 45,326