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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 5,529 | $ 4,168 | $ 10,597 | $ 8,068
Tax benefit | 1,456 | 1,131 | 2,790 | 2,131
Stock-based compensation expense, net of tax | 4,073 | 3,037 | 7,807 | 5,937
Instructional and support costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 1,781 | 1,281 | 3,388 | 2,506
General and administration |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 3,748 | 3,368 | 7,209 | 6,043
Restructuring costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 0 | $ (481) | $ 0 | $ (481)

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