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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | $ 3,900 | $ 3,025
Tax benefit | 1,000 | 777
Stock-based compensation expense, net of tax | 2,900 | 2,248
Instructional and support costs |  |
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | 1,225 | 1,030
General and administration |  |
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | $ 2,675 | $ 1,995

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