Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Expense
Share-based compensation expense	$ 13,204	$ 12,642	$ 11,526
Tax effect of share-based compensation	(3,301)	(3,161)	(2,882)
Share-based compensation expense, net of tax	9,903	9,481	8,644
Technology and academic services
Share-based Compensation Expense
Share-based compensation expense	2,365	2,424	2,112
Counseling services and support
Share-based Compensation Expense
Share-based compensation expense	6,862	6,287	5,749
Marketing and communication
Share-based Compensation Expense
Share-based compensation expense	190	154	101
General and administrative
Share-based Compensation Expense
Share-based compensation expense	$ 3,787	$ 3,777	$ 3,564

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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