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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | $ 18,149 | $ 14,610 | $ 12,160
Tax benefit | 4,809 | 3,771 | 3,126
Stock-based compensation expense, net of tax | 13,340 | 10,839 | 9,034
Instructional and support costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 5,317 | 5,111 | 3,823
General and administration |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 13,535 | 9,499 | 7,970
Merger and integration costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 0 | 0 | 367
Restructuring costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | $ (703) | $ 0 | $ 0

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