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Share-Based Compensation Plans - Additional Information (Details) shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2019 director | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2011
Share-based Compensation Plans |  |  |  |  |
Shares available for grant |  | 1,414 |  |  |
Minimum eligible age to participate in the plan |  | 21 years |  |  |
University made discretionary matching contributions | $ |  | $ 2,389 | $ 2,225 | $ 2,529 |
Maximum |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Shares authorized |  | 3,000 |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Shares granted |  | 184 | 167 | 152 |
Unrecognized share-based compensation cost | $ |  | $ 26,974 |  |  |
Costs are expected to be recognized over a weighted average period |  | 2 years 29 days |  |  |
Restricted Stock | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Shares granted |  | 180 | 164 | 149 |
Vesting period |  | 5 years |  |  |
Shares withheld for taxes |  | 56 | 62 | 68 |
Common stock in lieu of taxes | $ |  | $ 5,994 | $ 4,969 | $ 8,127 |
Restricted Stock | Share-based Payment Arrangement, Nonemployee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Shares granted |  | 4 | 3 | 3 |
Vesting period | 1 year | 1 year |  |  |
Number of new non-employee directors | director | 2 |  |  |  |
Restricted Stock | Share-based Compensation Award, Tranche One | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Vesting right percentage |  | 20.00% |  |  |
Restricted Stock | Share-based Compensation Award, Tranche Two | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Vesting right percentage |  | 20.00% |  |  |
Restricted Stock | Share-based Compensation Award, Tranche Three | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Vesting right percentage |  | 20.00% |  |  |
Restricted Stock | Share-based Compensation Award Tranche Four | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Vesting right percentage |  | 20.00% |  |  |
Restricted Stock | Share-based Compensation Award Tranche Five | Share-based Payment Arrangement, Employee |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Vesting right percentage |  | 20.00% |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Plans |  |  |  |  |
Vesting period |  |  |  |  | 5 years
Expiration period of options |  |  |  |  | 10 years

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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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