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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | $ 10,300 | $ 19,508 | $ 12,688
Tax effect of share-based compensation | (2,575) | (4,877) | (5,075)
Share-based compensation expense, net of tax | 7,725 | 14,631 | 7,613
Technology and Academic Services |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | 1,721 | 1,585 | 1,555
Counseling Support and Services |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | 5,297 | 4,926 | 4,700
Marketing and Communication [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | 87 | 48 | 26
General and Administrative [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | $ 3,195 | 3,355 | 3,402
University related expenses |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense |  | $ 9,594 | $ 3,005

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