Revenue Recognition - Graduation Fund (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Graduation Fund [Roll Forward]
Balance at beginning of period	$ 52,024	$ 53,314
Revenue deferred	16,897	21,067
Benefit redeemed	(22,079)	(22,357)
Balance at end of period	$ 46,842	$ 52,024