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Stock Options (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2018 |  | 788,977 | ​ | $ | 25.91 | ​ | ​ | ​ | ​ | ​ | ​
Plus: Options granted |  | 11,500 | ​ |  | 36.59 | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options exercised |  | 47,175 | ​ |  | 18.52 | ​ | ​ | ​ | ​ | ​ | ​
Options expired |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Options forfeited |  | 29,176 | ​ |  | 27.11 | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at June 30, 2019 |  | 724,126 | ​ |  | 26.51 |  | 5.80 | ​ | $ | 8,234 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and exercisable at June 30, 2019 |  | 369,795 | ​ | $ | 21.07 |  | 4.24 | ​ | $ | 6,159 | ​
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