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Share-Based Compensation Plans | 6 Months Ended
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Jun. 30, 2024
Share-Based Compensation Plans |
Share-Based Compensation Plans | 10. Share-Based Compensation Plans During the three and six months ended June 30, 2024, we recognized $331,000 and $698,000, respectively, of compensation expense associated with stock option and restricted stock awards granted in years 2019 through 2023. During the three and six months ended June 30, 2023, we recognized $337,000 and $675,000, respectively, 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 six-month period ended June 30, 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 |  | (49,962) | ​ | ​ | 24.44 |  |  |  | ​ |
Forfeited or expired |  | (5,880) | ​ | ​ | 25.05 |  |  |  | ​ |
Outstanding at June 30, 2024 |  | 911,375 | ​ | $ | 26.32 |  | 6.3 | ​ | $ | 4,440,000
Exercisable at June 30, 2024 |  | 480,188 | ​ | $ | 27.54 |  | 4.9 | ​ | $ | 2,128,000
​ *The aggregate intrinsic value of outstanding and exercisable stock options is defined as the difference between the market value of our common stock on June 28, 2024, the last trading day of the quarter, of $30.32 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 six-month period ended June 30, 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 - June 30, 2024 |  | 67,665 | ​ | $ | 25.55 | ​ | 2.2 | ​ | ​ | $ | 2,052,000 | ​
​ *The aggregate intrinsic value of non-vested restricted stock was calculated using the market value of our common stock on June 28, 2024, the last trading day of the quarter, of $30.32 multiplied by the number of non-vested restricted shares outstanding.

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