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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Expense |  |  |
Share-based compensation expense | $ 13,204 | $ 12,642 | $ 11,526
Tax effect of share-based compensation | (3,301) | (3,161) | (2,882)
Share-based compensation expense, net of tax | 9,903 | 9,481 | 8,644
Technology and academic services |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | 2,365 | 2,424 | 2,112
Counseling services and support |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | 6,862 | 6,287 | 5,749
Marketing and communication |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | 190 | 154 | 101
General and administrative |  |  |
Share-based Compensation Expense |  |  |
Share-based compensation expense | $ 3,787 | $ 3,777 | $ 3,564

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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