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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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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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

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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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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).

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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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