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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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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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