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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | $ 12,160 | $ 15,532 | $ 11,627
Tax benefit | 3,126 | 3,922 | 4,593
Stock-based compensation expense, net of tax | 9,034 | 11,610 | 7,034
Instructional and support costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 3,823 | 2,588 | 1,943
General and administration |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | 7,970 | 10,702 | 9,684
Merger and integration costs |  |  |
Schedule of stock-based compensation expense |  |  |
Stock-based compensation expense included in operating expense | $ 367 | $ 2,242 | $ 0

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