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Share-Based Compensation Plans | 3 Months Ended
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Mar. 31, 2024
Share-Based Compensation Plans |
Share-Based Compensation Plans | 10. Share-Based Compensation Plans During the three months ended March 31, 2024, we recognized $367,000 of compensation expense associated with stock option and restricted stock awards granted in years 2019 through 2023. During the three months ended March 31, 2023, we recognized $338,000 of compensation expense associated with stock option and restricted stock awards granted in years 2018 through 2022. The following table summarizes our stock option activity for the three-month period ended March 31, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price |  | Term (Years) |  | Value*
Outstanding at December 31, 2023 |  | 967,217 | ​ | $ | 26.22 |  |  |  | ​ |
Granted |  | — | ​ | ​ | — |  |  |  | ​ |
Exercised |  | (45,502) | ​ | ​ | 24.49 |  |  |  | ​ |
Forfeited or expired |  | (3,260) | ​ | ​ | 25.33 |  |  |  | ​ |
Outstanding at March 31, 2024 |  | 918,455 | ​ | $ | 26.31 |  | 6.5 | ​ | $ | 5,735,000
Exercisable at March 31, 2024 |  | 485,628 | ​ | $ | 27.50 |  | 5.2 | ​ | $ | 2,740,000
​ *The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of our common stock on March 28, 2024, the last trading day of the quarter, of $31.88 and the exercise price multiplied by the number of in-the-money outstanding and exercisable stock options. The following table summarizes our restricted stock award activity for the three-month period ended March 31, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | ​ | ​ |  | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​ | ​
​ | ​ | Shares of | ​ | Average | ​ | Remaining | ​ | ​ | Aggregate | ​
​ | ​ | Restricted | ​ | Grant Date | ​ | Contractual | ​ | ​ | Intrinsic | ​
​ | ​ | Stock | ​ | Fair Value | ​ | Term (Years) | ​ | ​ | Value* | ​
Non-vested - December 31, 2023 |  | 69,090 | ​ | $ | 25.54 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Issued |  | — | ​ |  | — | ​ |  | ​ | ​ |  | ​ | ​
Vested |  | (1,425) | ​ |  | 24.85 | ​ |  | ​ | ​ |  | ​ | ​
Forfeited |  | — | ​ |  | — | ​ |  | ​ | ​ |  | ​ | ​
Non-vested - March 31, 2024 |  | 67,665 | ​ | $ | 25.55 | ​ | 2.4 | ​ | ​ | $ | 2,157,000 | ​
​ *The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of our common stock on March 28, 2024, the last trading day of the quarter, of $31.88 multiplied by the number of non-vested restricted shares outstanding.

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