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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | $ 2,656 | $ 2,636
Tax effect of share-based compensation | (664) | (659)
Share-based compensation expense, net of tax | 1,992 | 1,977
Technology and Academic Services |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | 518 | 434
Counseling Services and Support |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | 1,330 | 1,334
Marketing and Communication [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | 25 | 19
University related expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Share-based compensation expense | $ 783 | $ 849

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