Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Expense
Share-based compensation expense	$ 6,622	$ 6,361
Tax effect of share-based compensation	(1,656)	(1,590)
Share-based compensation expense, net of tax	4,966	4,771
Technical and Academic Services
Share-based Compensation Expense
Share-based compensation expense	1,222	1,200
Counseling Support and Services
Share-based Compensation Expense
Share-based compensation expense	3,438	3,143
Marketing and Communication
Share-based Compensation Expense
Share-based compensation expense	94	75
General and Administrative
Share-based Compensation Expense
Share-based compensation expense	$ 1,868	$ 1,943

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.

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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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