Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Expense
Share-based compensation expense	$ 9,958	$ 9,484
Tax effect of share-based compensation	(2,489)	(2,371)
Share-based compensation expense, net of tax	7,469	7,113
Technology and academic services
Share-based Compensation Expense
Share-based compensation expense	1,814	1,812
Counseling services and support
Share-based Compensation Expense
Share-based compensation expense	5,155	4,720
Marketing and communication
Share-based Compensation Expense
Share-based compensation expense	143	114
General and administrative
Share-based Compensation Expense
Share-based compensation expense	$ 2,846	$ 2,838

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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