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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Expense |  |  |
Share-based compensation expense | $ 11,526 | $ 10,663 | $ 10,300
Tax effect of share-based compensation | (2,882) | (2,666) | (2,575)
Share-based compensation expense, net of tax | 8,644 | 7,997 | 7,725
Technical and Academic Services |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | 2,112 | 2,049 | 1,721
Counseling Support and Services |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | 5,749 | 5,364 | 5,297
Marketing and Communication |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | 101 | 100 | 87
General and Administrative |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | $ 3,564 | $ 3,150 | $ 3,195

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