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Equity Awards - Stock-based compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | $ 3,025 | $ 3,010
Tax benefit | 777 | 759
Stock-based compensation expense, net of tax | 2,248 | 2,251
Instructional and support costs |  |
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | 1,030 | 858
General and administration |  |
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | 1,995 | 1,673
Merger and integration costs |  |
Schedule of stock-based compensation expense |  |
Stock-based compensation expense included in operating expense | $ 0 | $ 479

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