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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Expense
Share-based compensation expense	$ 11,526	$ 10,663	$ 10,300
Tax effect of share-based compensation	(2,882)	(2,666)	(2,575)
Share-based compensation expense, net of tax	8,644	7,997	7,725
Technical and Academic Services
Share-based Compensation Expense
Share-based compensation expense	2,112	2,049	1,721
Counseling Support and Services
Share-based Compensation Expense
Share-based compensation expense	5,749	5,364	5,297
Marketing and Communication
Share-based Compensation Expense
Share-based compensation expense	101	100	87
General and Administrative
Share-based Compensation Expense
Share-based compensation expense	$ 3,564	$ 3,150	$ 3,195

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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