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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Share-Based Compensation Plans - Additional Information (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Plans
Shares available for grant	1,081
Minimum eligible age to participate in the plan	21 years
University made discretionary matching contributions	$ 2,951	$ 2,744	$ 2,345
Maximum
Share-based Compensation Plans
Shares authorized	3,000
Restricted Stock Grants
Share-based Compensation Plans
Shares granted	140	193	184
Unrecognized share-based compensation cost	$ 30,329
Costs are expected to be recognized over a weighted average period	2 years 18 days
Restricted Stock Grants \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Shares granted	136	189	180
Vesting period	5 years
Shares withheld for taxes	56	52	56
Common stock in lieu of taxes	$ 6,331	$ 4,625	$ 5,994
Restricted Stock Grants \| Share-based Payment Arrangement, Nonemployee
Share-based Compensation Plans
Shares granted	4	4	4
Vesting period	1 year
Restricted Stock Grants \| Share-based Compensation Award, Tranche One \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Vesting right percentage	20.00%
Restricted Stock Grants \| Share-based Compensation Award, Tranche Two \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Vesting right percentage	20.00%
Restricted Stock Grants \| Share-based Compensation Award, Tranche Three \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Vesting right percentage	20.00%
Restricted Stock Grants \| Share-based Compensation Award Tranche Four \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Vesting right percentage	20.00%
Restricted Stock Grants \| Share-based Compensation Award Tranche Five \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Vesting right percentage	20.00%
Employee Stock Option
Share-based Compensation Plans
Vesting period	5 years
Expiration period of options	10 years