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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2018 |  | 460 | ​ | $ | 63.28
Granted |  | 152 | ​ | $ | 93.62
Vested |  | (174) | ​ | $ | 56.14
Forfeited, canceled or expired |  | (16) | ​ | $ | 82.11
Outstanding as of December 31, 2019 |  | 422 | ​ | $ | 76.43
Granted |  | 167 | ​ | $ | 84.31
Vested |  | (155) | ​ | $ | 65.19
Forfeited, canceled or expired |  | (15) | ​ | $ | 84.64
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
Schedule of activity related to stock options granted under company's incentive plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Summary of Stock Options Outstanding
​ |  | ​ |  | Weighted |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Exercise | ​ | Remaining | ​ | Aggregate
​ | ​ | Total | ​ | Price per | ​ | Contractual | ​ | Intrinsic
​ | ​ | Shares | ​ | Share | ​ | Term (Years) | ​ | Value ($)
Outstanding as of December 31, 2018 |  | 444 | ​ | $ | 16.66 | ​ | ​ | ​ | ​ | ​
Granted |  | — | ​ | $ | — |  |  |  | ​ |
Exercised |  | (212) | ​ | $ | 18.01 |  |  |  | ​ |
Forfeited, canceled or expired |  | — | ​ | $ | — |  |  |  | ​ |
Outstanding as of December 31, 2019 |  | 232 | ​ | $ | 15.42 | ​ | ​ | ​ | ​ | ​
Granted |  | — | ​ | $ | — |  |  |  | ​ |
Exercised |  | (56) | ​ | $ | 15.66 |  |  |  | ​ |
Forfeited, canceled or expired |  | — | ​ | $ | — |  |  |  | ​ |
Outstanding as of December 31, 2020 |  | 176 | ​ | $ | 15.34 | ​ | ​ | ​ | ​ | ​
Granted |  | — | ​ | $ | — |  |  |  | ​ |
Exercised |  | (176) | ​ | $ | 15.34 |  |  |  | ​ |
Forfeited, canceled or expired |  | — | ​ | $ | — |  |  |  | ​ |
Outstanding as of December 31, 2021 |  | — | ​ | $ | — |  | — | ​ | $ | —
Exercisable as of December 31, 2021 |  | — | ​ | $ | — |  | — | ​ | $ | —
​
Schedule of share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020 |  | 2019 |
Technology and academic services | ​ | $ | 2,112 | ​ | $ | 2,049 | ​ | $ | 1,721 | ​
Counseling services and support | ​ |  | 5,749 | ​ |  | 5,364 | ​ |  | 5,297 | ​
Marketing and communication | ​ |  | 101 | ​ |  | 100 | ​ |  | 87 | ​
General and administrative | ​ |  | 3,564 | ​ |  | 3,150 | ​ |  | 3,195 | ​
Share-based compensation expense included in operating expenses | ​ |  | 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 | ​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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