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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 5,612 | $ 4,646 | $ 16,209 | $ 12,714
Tax benefit | 1,460 | 1,228 | 4,250 | 3,359
Stock-based compensation expense, net of tax | 4,152 | 3,418 | 11,959 | 9,355
Instructional and support costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 1,802 | 1,365 | 5,190 | 3,871
General and administration |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 3,810 | 3,503 | 11,019 | 9,546
Restructuring costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 0 | $ (222) | $ 0 | $ (703)

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