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Equity Awards - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | $ 19,772 | $ 21,792 | $ 18,149
Tax benefit | 5,156 | 5,488 | 4,809
Stock-based compensation expense, net of tax | 14,616 | 16,304 | 13,340
Instructional and support costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 5,804 | 7,026 | 5,317
General and administration |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 13,461 | 14,766 | 13,535
Restructuring costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | $ 507 | $ 0 | $ (703)

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