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Equity Plan Awards (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of Option Activity | Option activity within each plan is as follows:
|  | Incentive Stock Option Plans |  |  | Weighted Average Price Per Share |  |  | Exercisable Weighted Average Price Per Share |
Balance outstanding, December 31, 2015 |  |  | 626,845 |  |  | $ | 9.25 |  |  | $ | 7.73 |
Options exercised, |  |  | (58,900 | ) |  | $ | 7.50 |  |  |  |  |
Options forfeited, |  |  | (26,040 | ) |  |  | 11.49 |  |  |  |  |
Balance outstanding, December 31, 2016 |  |  | 541,905 |  |  | $ | 9.33 |  |  | $ | 7.97 |
Options exercised, |  |  | (55,979 | ) |  | $ | 8.37 |  |  |  |  |
Options forfeited, |  |  | (13,143 | ) |  |  | 11.49 |  |  |  |  |
Balance outstanding, December 31, 2017 |  |  | 472,783 |  |  | $ | 9.38 |  |  | $ | 9.38 |
Options exercised, |  |  | (88,719 | ) |  | $ | 10.62 |  |  |  |  |
Options forfeited, |  |  | — |  |  |  | — |  |  |  |  |
Balance outstanding, December 31, 2018 |  |  | 384,064 |  |  | $ | 9.10 |  |  | $ | 9.10 |
Summary of Stock Options Summarized by Exercise Price | Information relating to stock options at December 31, 2018 summarized by exercise price is as follows:
|  | Outstanding Weighted Average |  |  | Exercisable Weighted Average |
Exercise Price Per Share |  | Shares |  |  | Remaining Life (Months) |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
Incentive Stock Option Plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$7.50 |  |  | 229,545 |  |  |  | 23 |  |  | $ | 7.50 |  |  |  | 229,545 |  |  | $ | 7.50 |
$11.32-$14.75 |  |  | 154,519 |  |  |  | 70 |  |  | $ | 11.48 |  |  |  | 154,519 |  |  | $ | 11.48 |
|  |  | 384,064 |  |  |  | 42 |  |  | $ | 9.10 |  |  |  | 384,064 |  |  | $ | 9.10 |
Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding | The weighted average exercise prices for options granted and exercisable and the weighted average remaining contractual life for options outstanding as of December 31, 2018 and 2017 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Months) |  |  | Intrinsic Value (thousands) |
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 384,064 |  |  | $ | 9.10 |  |  |  | 42 |  |  | $ | 2,338 |
Vested |  |  | 384,064 |  |  | $ | 9.10 |  |  |  | 42 |  |  | $ | 2,338 |
Exercisable |  |  | 384,064 |  |  | $ | 9.10 |  |  |  | 42 |  |  | $ | 2,338 |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 472,783 |  |  | $ | 9.38 |  |  |  | 57 |  |  | $ | 4,853 |
Vested |  |  | 472,783 |  |  | $ | 9.38 |  |  |  | 57 |  |  | $ | 4,853 |
Exercisable |  |  | 472,783 |  |  | $ | 9.38 |  |  |  | 57 |  |  | $ | 4,853 |
Performance Based Stock Options |
Summary of Option Activity | Performance option activity is as follows:
|  | Incentive Stock Option Plans |  |  | Weighted Average Price Per Share |  |  | Exercisable Weighted Average Price Per Share |
Balance outstanding, December 31, 2016 |  |  | 82,334 |  |  | $ | 11.49 |  |  | $ | — |
Options forfeited |  |  | (668 | ) |  |  | 11.49 |  |  |  | — |
Balance outstanding, December 31, 2017 |  |  | 81,666 |  |  | $ | 11.49 |  |  | $ | 11.49 |
Additional vesting based on performance |  |  | 77,598 |  |  |  | 11.49 |  |  |  | 11.49 |
Options exercised |  |  | (18,853 | ) |  |  | 11.49 |  |  |  | 11.49 |
Balance outstanding, December 31, 2018 |  |  | 140,411 |  |  | $ | 11.49 |  |  | $ | 11.49 |
Performance Incentive Stock Option Plan |
Summary of Stock Options Summarized by Exercise Price | Information relating to performance stock options at December 31, 2018 is summarized by exercise price is as follows:
|  | Outstanding Weighted Average |  |  | Exercisable Weighted Average |
Exercise Price Per Share |  | Shares |  |  | Remaining Life (Months) |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
Performance Incentive Stock Option Plan: |  |  | 140,411 |  |  |  | 72 |  |  | $ | 11.49 |  |  |  | 140,411 |  |  | $ | 11.49 |
Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding | The weighted average exercise price for performance options granted and exercisable and the weighted average remaining contractual life for performance options outstanding as of December 31, 2018 and 2017 was as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Months) |  |  | Intrinsic Value (thousands) |
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 140,411 |  |  | $ | 11.49 |  |  |  | 72 |  |  | $ | 520 |
Expected to Vest |  |  | 140,411 |  |  | $ | 11.49 |  |  |  | 72 |  |  | $ | 520 |
Exercisable |  |  | 140,411 |  |  | $ | 11.49 |  |  |  | 72 |  |  | $ | 520 |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 81,666 |  |  | $ | 11.49 |  |  |  | 84 |  |  | $ | 666 |
Expected to Vest |  |  | 81,666 |  |  | $ | 11.49 |  |  |  | 84 |  |  | $ | 666 |
Exercisable |  |  | 81,666 |  |  | $ | 11.49 |  |  |  | 84 |  |  | $ | 666 |
Common Stock Grants |
Summary of Non-Vested Shares | A status summary of non-vested shares as of December 31, 2018 and 2017, are presented below:
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested shares at January 1st |  |  | 391,753 |  |  | $ | 15.61 |  |  |  | 324,756 |  |  | $ | 14.75 |
Granted |  |  | 282,030 |  |  |  | 20.21 |  |  |  | 290,977 |  |  |  | 16.24 |
Vested |  |  | (53,304 | ) |  |  | 17.06 |  |  |  | (203,165 | ) |  |  | 15.14 |
Forfeited |  |  | (33,269 | ) |  |  | 17.29 |  |  |  | (20,815 | ) |  |  | 15.29 |
Nonvested shares at December 31st |  |  | 587,210 |  |  | $ | 17.59 |  |  |  | 391,753 |  |  | $ | 15.61 |
Performance Based Restricted Shares |
Summary of Non-Vested Shares | A summary of non-vested shares as of December 31, 2018 and 2017, is presented below:
|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested shares at January 1st |  |  | 186,057 |  |  | $ | 14.93 |  |  |  | 119,022 |  |  | $ | 14.18 |
Granted |  |  | 130,332 |  |  |  | 18.74 |  |  |  | 128,594 |  |  |  | 15.43 |
Vested |  |  | (22,857 | ) |  |  | 11.90 |  |  |  | (48,046 | ) |  |  | 14.92 |
Forfeited |  |  | (6,455 | ) |  |  | 16.22 |  |  |  | (13,513 | ) |  |  | 13.08 |
Nonvested shares at December 31st |  |  | 287,077 |  |  | $ | 16.87 |  |  |  | 186,057 |  |  | $ | 14.93 |

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