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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | $ 7,740 | $ 17,066
Tax effect of share-based compensation | (1,935) | (4,267)
Share-based compensation expense, net of tax | 5,805 | 12,799
Technology and Academic Services [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | 1,289 | 1,195
Counseling Support and Services [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | 3,977 | 3,707
Marketing and Communication [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | 64 | 40
General and Administrative [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | $ 2,410 | 2,530
University related expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense |  | $ 9,594

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