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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 5,068	$ 3,900
Tax benefit	1,334	1,000
Stock-based compensation expense, net of tax	3,734	2,900
Instructional and support costs
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	1,607	1,225
General and administration
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 3,461	$ 2,675

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Amount, after tax, of expense for award under share-based payment arrangement.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 718
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Amount of noncash expense for share-based payment arrangement.

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-Topic 230
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