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Summary of Stock Activity (Details) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) Years $ / shares shares | Dec. 31, 2017 USD ($) Years $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Options outstanding | shares | 124,653 | 174,510
Options granted | shares | 0 |
Options exercised | shares | (49,857) |
Options outstanding weighted average exercise price | $ / shares | $ 30.31 | $ 28.70
Options outstanding weighted average exercise price - Granted | $ / shares | 0 |
Options outstanding weighted average exercise price - Exercised | $ / shares | $ 24.69 |
Options outstanding weighted average remaining term | Years | 6.1 | 6.0
Options outstanding weighted average grant date fair value | $ | $ 1,406 | $ 1,901
Options granted weighted average grant date fair value | $ | 0 |
Options exercised weighted average grant date fair value | $ | $ (495) |
Options exercisable at September 30, 2018 | shares | 108,188 |
Options exerciseable weighted average exercise price | $ / shares | $ 30.34 |
Options exerciseable weighted average remaining term | Years | 6.0 |
Options vested weighted average grant date fair value | $ | $ 454 |
Options vested during nine months ended September 30, 2018 | shares | 28,129 |
Options exercisable weighted average grant date fair value | $ | $ 1,182 |

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