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Share-Based Compensation Plans - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Expense |  |
Share-based compensation expense | $ 6,361 | $ 5,959
Tax effect of share-based compensation | (1,590) | (1,490)
Share-based compensation expense, net of tax | 4,771 | 4,469
Technical and Academic Services |  |
Share-based Compensation Expense |  |
Share-based compensation expense | 1,200 | 1,158
Counseling Support and Services |  |
Share-based Compensation Expense |  |
Share-based compensation expense | 3,143 | 2,971
Marketing and Communication |  |
Share-based Compensation Expense |  |
Share-based compensation expense | 75 | 51
General and Administrative |  |
Share-based Compensation Expense |  |
Share-based compensation expense | $ 1,943 | $ 1,779

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