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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 4,646 | $ 3,875 | $ 12,714 | $ 10,759
Tax benefit | 1,228 | 997 | 3,359 | 2,767
Stock-based compensation expense, net of tax | 3,418 | 2,878 | 9,355 | 7,992
Instructional and support costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 1,365 | 1,390 | 3,871 | 3,776
General and administration |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 3,503 | 2,485 | 9,546 | 6,983
Restructuring costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ (222) | $ 0 | $ (703) | $ 0

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