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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 |  |

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