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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Stock-Based Compensation |
Summary of changes in, the Company's stock option awards | The Company has outstanding stock options assumed from acquisitions. A summary of the status of, and changes in, the Company's stock option awards for the six months ended June 30, 2022, follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ |  |  | Weighted- | ​ | Average
​ | ​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | ​ | Exercise | ​ | Contractual
​ |  | Shares |  | Price |  | Life
Options outstanding at December 31, 2021 | ​ | ​ | 31,386 | ​ | $ | 23.53 | ​ | ​ | 4.88
Expired | ​ | ​ | (220) | ​ |  | 23.53 | ​ | ​ | ​
Options outstanding at June 30, 2022 | ​ | ​ | 31,166 | ​ | $ | 23.53 | ​ | ​ | 4.38
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercisable at June 30, 2022 | ​ | ​ | 31,166 | ​ | $ | 23.53 | ​ | ​ | 4.38
Summary of changes in the Company's RSU, PSU, and DSU awards | A summary of changes in the Company’s RSU, PSU, and DSU awards for the six months ended June 30, 2022, is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | RSU Awards | ​ | PSU Awards | ​ | DSU Awards
​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value |  | Shares (1) |  | Fair Value |  | Shares |  | Fair Value
Nonvested at December 31, 2021 |  | ​ | 1,147,927 |  | $ | 23.97 |  | ​ | 113,915 |  | $ | 22.86 |  | ​ | 34,135 |  | $ | 24.59
Granted |  | ​ | 156,483 | ​ |  | 25.79 |  | ​ | 195,240 | ​ |  | 25.79 |  | ​ | 32,658 | ​ |  | 25.79
Dividend equivalents earned |  | ​ | 22,800 | ​ |  | 24.52 |  | ​ | — | ​ |  | — |  | ​ | 2,797 | ​ |  | 24.38
Vested |  | ​ | (136,084) | ​ |  | 29.27 |  | ​ | — | ​ |  | — |  | ​ | (39,065) | ​ |  | 24.67
Forfeited |  | ​ | (23,966) | ​ |  | 23.65 |  | ​ | (2,339) | ​ |  | 24.30 |  | ​ | — | ​ |  | —
Nonvested at June 30, 2022 |  | ​ | 1,167,160 |  | $ | 23.62 |  | ​ | 306,816 |  | $ | 24.71 |  | ​ | 30,525 |  | $ | 25.76
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested and outstanding at June 30, 2022 |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | 115,208 |  | $ | 22.80
| (1) | Shares for PSU awards represent target shares at grant date.
Schedule of Stock-based compensation expense | The Company recognized compensation expense related to nonvested RSU, PSU, and DSU awards, as well as the 2021 ESPP, as summarized in the table below (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
Stock-based compensation expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSU awards | ​ | $ | 1,273 | ​ | $ | 1,816 | ​ | $ | 2,449 | ​ | $ | 3,046
PSU awards | ​ | ​ | 758 | ​ | ​ | 268 | ​ | ​ | 1,170 | ​ | ​ | 328
DSU awards | ​ | ​ | 257 | ​ | ​ | 353 | ​ | ​ | 483 | ​ | ​ | 511
2021 ESPP | ​ | ​ | 48 | ​ | ​ | — | ​ | ​ | 143 | ​ | ​ | —
Total stock-based compensation expense | ​ | $ | 2,336 | ​ | $ | 2,437 | ​ | $ | 4,245 | ​ | $ | 3,885
Schedule of Unamortized stock-based compensation expense | Unamortized compensation expense related to nonvested RSU, PSU, and DSU awards is summarized in the table below (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2022 |  | 2021 |
Unamortized stock-based compensation | ​ | ​ | ​ | ​ | ​ | ​ | ​
RSU awards | ​ | $ | 11,273 | ​ | $ | 10,204 | ​
PSU awards | ​ | ​ | 4,973 | ​ | ​ | 1,547 | ​
DSU awards | ​ | ​ | 568 | ​ | ​ | 209 | ​
Total unamortized stock-based compensation | ​ | $ | 16,814 | ​ | $ | 11,960 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average period over which expense is to be recognized | ​ | ​ | 2.8 | yrs | ​ | 2.9 | yrs
Schedule of shares remaining available for issuance pursuant to authorized plans | Shares remaining available for issuance pursuant to authorized stock-based compensation plans as of June 30, 2022, were as follows: ​
​ | ​ | ​ | ​
​ | ​ | Shares Remaining
​ | ​ | Available for Issuance
​ |  | Pursuant to the Plan
2020 Equity Plan | ​ | ​ | 644,174
2021 Employee Stock Purchase Plan | ​ | ​ | 530,570

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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