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Stock Options (Tables) | 3 Months Ended
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Mar. 31, 2024
Stock Options |
Summary of option activity under stock option plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | average | ​ | remaining | ​ | Aggregate | ​
​ | ​ | Number of | ​ | exercise | ​ | contractual | ​ | intrinsic | ​
​ | ​ | options | ​ | price | ​ | term (years) | ​ | value ($) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands) | ​
Options outstanding at December 31, 2023 |  | 383,865 | ​ | $ | 30.65 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | (103,575) | ​ |  | 22.14 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | (20,937) | ​ |  | 23.27 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at March 31, 2024 |  | 259,353 | ​ |  | 34.64 |  | 4.56 | ​ | $ | 5,577 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at March 31, 2024 |  | 118,195 | ​ | $ | 33.56 |  | 3.57 | ​ | $ | 2,669 | ​
Summary of activity under the SAR Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​ | ​
​ | ​ | Number of | ​ | average | ​ | remaining | ​ | Aggregate
​ | ​ | stock appreciation | ​ | exercise | ​ | contractual | ​ | intrinsic
​ | ​ | rights | ​ | price | ​ | term (years) | ​ | value ($)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (in Thousands)
SARs outstanding at December 31, 2023 |  | 465,250 | ​ | $ | 39.35 | ​ | ​ | ​ | ​ | ​
Plus: SARs granted |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
SARs exercised |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
SARs expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​
SARs forfeited |  | (10,000) | ​ | ​ | 39.33 | ​ | ​ | ​ | ​ | ​
SARs outstanding at March 31, 2024 |  | 455,250 | ​ |  | 39.35 |  | 8.25 | ​ | ​ | 7,643
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
SARs fully vested and exercisable at March 31, 2024 |  | — | ​ | $ | — |  | ​ | ​ | ​ | ​

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