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Stock Options (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2017 |  | 668,166 |  | $ | 20.41 |  |  |  |  |  |
Plus: Options granted |  | 229,700 |  |  | 38.30 |  |  |  |  |  |
Less: |  |  |  |  |  |  |  |  |  |  |
Options exercised |  | 64,026 |  |  | 18.00 |  |  |  |  |  |
Options expired |  | — |  |  | — |  |  |  |  |  |
Options forfeited |  | 21,113 |  |  | 20.83 |  |  |  |  |  |
Options outstanding at September 30, 2018 |  | 812,727 |  |  | 25.65 |  | 6.22 |  | $ | 15,728 |
Options fully vested and exercisable at September 30, 2018 |  | 322,360 |  | $ | 19.77 |  | 4.37 |  | $ | 8,135 |

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