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Stock Options (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2019 |  | 658,588 | ​ | $ | 27.55 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | 29,500 | ​ |  | 17.57 | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | 13,611 | ​ |  | 21.15 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | 9,451 | ​ |  | 30.35 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at June 30, 2020 |  | 665,026 | ​ |  | 27.20 |  | 5.49 | ​ | $ | 4,591 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at June 30, 2020 |  | 411,269 | ​ | $ | 22.86 |  | 4.06 | ​ | $ | 3,968 | ​
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