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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Compensation Plans |
Schedule of activity related to restricted stock granted under company's incentive plan | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted Average
​ | ​ | Total | ​ | Grant Date
​ | ​ | Shares | ​ | Fair Value per Share
Outstanding as of December 31, 2020 |  | 419 | ​ | $ | 83.43
Granted |  | 184 | ​ | $ | 86.05
Vested |  | (144) | ​ | $ | 74.90
Forfeited, canceled or expired |  | (32) | ​ | $ | 87.00
Outstanding as of December 31, 2021 |  | 427 | ​ | $ | 86.24
Granted |  | 193 | ​ | $ | 83.10
Vested |  | (134) | ​ | $ | 85.07
Forfeited, canceled or expired |  | (10) | ​ | $ | 85.49
Outstanding as of December 31, 2022 |  | 476 | ​ | $ | 85.32
Granted |  | 140 | ​ | $ | 112.60
Vested |  | (147) | ​ | $ | 86.94
Forfeited, canceled or expired |  | (19) | ​ | $ | 87.87
Outstanding as of December 31, 2023 |  | 450 | ​ | $ | 93.16
Schedule of activity related to stock options granted under company's incentive plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Summary of Stock Options Outstanding
​ |  | ​ |  | Weighted |
​ | ​ | ​ | ​ | Average | ​
​ | ​ | ​ | ​ | Exercise | ​
​ | ​ | Total | ​ | Price per | ​
​ | ​ | Shares | ​ | Share | ​
Outstanding as of December 31, 2020 |  | 176 | ​ | $ | 15.34 | ​
Granted |  | — | ​ | $ | — |
Exercised |  | (176) | ​ | $ | 15.34 |
Forfeited, canceled or expired |  | — | ​ | $ | — |
Outstanding as of December 31, 2021 |  | — | ​ | $ | — | ​
​
Schedule of share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Technology and academic services | ​ | $ | 2,365 | ​ | $ | 2,424 | ​ | $ | 2,112
Counseling services and support | ​ |  | 6,862 | ​ |  | 6,287 | ​ |  | 5,749
Marketing and communication | ​ |  | 190 | ​ |  | 154 | ​ |  | 101
General and administrative | ​ |  | 3,787 | ​ |  | 3,777 | ​ |  | 3,564
Share-based compensation expense included in operating expenses | ​ |  | 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

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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