Minimum eligible age to participate in the plan

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- Definition

Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

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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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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- Definition

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.

+ References

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- Definition

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.

+ References

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-Publisher FASB
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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.

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-Publisher FASB
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-Topic 718
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-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
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- Definition

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

+ References

No definition available.

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Share-Based Compensation Plans - Additional Information (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2011
Share-based Compensation Plans
Shares available for grant	1,221
Minimum eligible age to participate in the plan	21 years
University made discretionary matching contributions	$ 2,662	$ 2,345	$ 2,225
Maximum
Share-based Compensation Plans
Shares authorized	3,000
Restricted Stock Grants
Share-based Compensation Plans
Shares granted	193	184	167
Unrecognized share-based compensation cost	$ 29,497
Costs are expected to be recognized over a weighted average period	2 years 29 days
Restricted Stock Grants \| Share-based Payment Arrangement, Employee
Share-based Compensation Plans
Shares granted	189	180	164
Vesting period	5 years
Shares withheld for taxes	52	56	62
Common stock in lieu of taxes	$ 4,625	$ 5,994	$ 4,969
Restricted Stock Grants \| Share-based Payment Arrangement, Nonemployee
Share-based Compensation Plans
Shares granted	4	4	3
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%
Stock Options
Share-based Compensation Plans
Vesting period				5 years
Expiration period of options				10 years