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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 3,859 | $ 3,566 | $ 6,884 | $ 6,576
Tax benefit | 993 | 923 | 1,770 | 1,682
Stock-based compensation expense, net of tax | 2,866 | 2,643 | 5,114 | 4,894
Instructional and support costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 1,356 | 1,017 | 2,386 | 1,875
General and administration |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | 2,503 | 2,138 | 4,498 | 3,811
Merger and integration costs |  |  |  |
Schedule of stock-based compensation expense |  |  |  |
Stock-based compensation expense included in operating expense | $ 0 | $ 411 | $ 0 | $ 890

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