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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |
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 three months ended March 31, 2023, follows:
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life
Options outstanding at December 31, 2022 | 26,106 |  | $ | 23.53 |  |  | 3.88
Forfeited | (3,300) |  | 23.53 |  |  |
Options outstanding at March 31, 2023 | 22,806 |  | 23.53 |  |  | 3.63
Options exercisable at March 31, 2023 | 22,806 |  | 23.53 |  |  | 3.63
Summary of changes in the Company's RSU, PSU, and DSU awards | A summary of changes in the Company’s RSU awards for the three months ended March 31, 2023, is as follows:
| RSU Awards
| Shares |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2022 | 1,096,931 |  | $ | 23.61 |
Granted | 224,316 |  | 20.44 |
Dividend equivalents earned | 11,509 |  | 22.85 |
Vested | (4,308) |  | 25.79 |
Forfeited | (6,863) |  | 20.88 |
Nonvested at March 31, 2023 | 1,321,585 |  | 23.07 |
A summary of changes in the Company’s PSU awards for the three months ended March 31, 2023, is as follows:
| PSU Awards
| Shares 1 |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2022 | 285,351 |  |  | $ | 25.40 |
Granted | 224,331 |  |  | 20.44 |
Dividend equivalents earned | 92 |  |  | 22.85 |
Vested | (92) |  |  | 22.85 |
Forfeited | (36,345) |  |  | 25.24 |
Nonvested at March 31, 2023 | 473,337 |  |  | 23.06 |
___________________________________________ 1.Shares for PSU awards represent target shares at grant date. A summary of changes in the Company’s DSU awards for the three months ended March 31, 2023, is as follows:
| DSU Awards
| Shares |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2022 | 31,085 |  |  | $ | 25.75 |
Granted | 41,548 |  |  | 20.44 |
Dividend equivalents earned | 1,507 |  |  | 22.86 |
Vested | (32,592) |  |  | 25.61 |
Nonvested at March 31, 2023 | 41,548 |  |  | 20.44 |
Vested and outstanding at March 31, 2023 | 145,026 |  |  | 23.66 |
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 March 31,
|  |  |  |  | 2023 |  | 2022
Stock-based compensation expense |  |  |  |  |  |  |
RSU awards |  |  |  |  | $ | 1,020 |  |  | $ | 1,176 |
PSU awards 1 |  |  |  |  | 360 |  |  | 412 |
DSU awards |  |  |  |  | 196 |  |  | 226 |
2021 ESPP |  |  |  |  | 93 |  |  | 95 |
Total stock-based compensation expense |  |  |  |  | $ | 1,669 |  |  | $ | 1,909 |
___________________________________________ 1.Expense for market-based PSU awards represents amounts based on target shares at grant date. Expense for performance-based PSU awards represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.
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
| March 31, 2023 |  | December 31, 2022
Unamortized stock-based compensation |  |  |
RSU awards | $ | 12,005 |  |  | $ | 8,570 |
PSU awards 1 | 8,632 |  |  | 4,279 |
DSU awards | 829 |  |  | 175 |
Total unamortized stock-based compensation | $ | 21,466 |  |  | $ | 13,024 |
Weighted average period over which expense is to be recognized | 2.8 years |  | 2.5 years
___________________________________________ 1.Unamortized expense for market-based PSU awards represents amounts based on target shares at grant date. Unamortized expense for performance-based PSU awards represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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