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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 3,875 | $ 2,499 | $ 10,759 | $ 9,075
Tax benefit | 997 | 651 | 2,767 | 2,333
Stock-based compensation expense, net of tax | 2,878 | 1,848 | 7,992 | 6,742
Instructional and support costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 1,390 | 945 | 3,776 | 2,820
General and administration |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 2,485 | 2,077 | 6,983 | 5,888
Merger and integration costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 0 | $ (523) | $ 0 | $ 367

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