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Stock Based Compensation Expense (Tables) | 3 Months Ended
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Mar. 31, 2015
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, 2014 |  |  | 724,904 |  |  | $ | 9.22 |  |  | $ | 7.82 |
Options exercised, $7.50 |  |  | (16,650 | ) |  |  | 7.50 |  |  |  |  |
Options forfeited, $11.49 and $13.24 |  |  | (10,400 | ) |  |  | 11.49 |  |  |  |  |
Balance outstanding, March 31, 2015 |  |  | 697,854 |  |  | $ | 9.21 |  |  | $ | 7.71 |
Summary of Stock Options Summarized by Exercise Price | Information relating to stock options at March 31, 2015 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 |  |  | 404,550 |  |  |  | 68 |  |  | $ | 7.50 |  |  |  | 404,550 |  |  | $ | 7.50 |
$11.32—$14.75 |  |  | 293,304 |  |  |  | 114 |  |  | $ | 11.56 |  |  |  | 16,679 |  |  | $ | 12.69 |
|  |  | 697,854 |  |  |  |  |  |  | $ | 9.21 |  |  |  | 421,229 |  |  | $ | 7.71 |
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 March 31, 2015 were as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Months) |  |  | Intrinsic Value (thousands) |
As of March 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 697,854 |  |  | $ | 9.21 |  |  |  | 87 |  |  | $ | 1,262 |
Expected to Vest |  |  | 686,973 |  |  | $ | 9.17 |  |  |  | 89 |  |  | $ | 1,262 |
Exercisable |  |  | 421,229 |  |  | $ | 7.71 |  |  |  | 71 |  |  | $ | 1,262 |
Performance Incentive Stock Option Plan |
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, 2014 |  |  | 107,689 |  |  | $ | 11.49 |  |  | $ | — |
Balance outstanding, March 31, 2015 |  |  | 107,689 |  |  | $ | 11.49 |  |  | $ | — |
Summary of Stock Options Summarized by Exercise Price | Information relating to stock options at March 31, 2015 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$11.49 |  |  | 107,689 |  |  |  | 33 |  |  | $ | 11.49 |  |  |  | — |  |  | $ | — |
|  |  | 107,689 |  |  |  |  |  |  | $ | 11.49 |  |  |  | — |  |  | $ | — |
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 March 31, 2015 are as follows:
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Months) |  |  | Intrinsic Value (thousands) |
As of March 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Stock Option Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding |  |  | 107,689 |  |  | $ | 11.49 |  |  |  | 33 |  |  | $ | — |
Expected to Vest |  |  | 107,689 |  |  | $ | 11.49 |  |  |  | 33 |  |  | $ | — |
Exercisable |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Restricted Stock |
Summary of Non-Vested Shares | Restricted Shares— A summary of non-vested shares as of and for the three months ended March 31, 2015 is presented below:
|  | Number of Shares |  |  | Weighted Average Grant- Date Fair Value |
Nonvested shares at December 31, 2014 |  |  | 560,842 |  |  | $ | 21.44 |
Granted |  |  | 30,000 |  |  |  | 11.42 |
Vested |  |  | (192,266 | ) |  |  | 20.47 |
Forfeited |  |  | (422 | ) |  |  | 14.92 |
Nonvested shares at March 31, 2015 |  |  | 398,154 |  |  | $ | 21.17 |
Performance Shares |
Summary of Non-Vested Shares | Performance Based Shares—A summary of non-vested performance based shares as of and for the three months ended March 31, 2015 is presented below:
|  | Number of Shares |  |  | Weighted Average Grant- Date Fair Value |
Nonvested shares at December 31, 2014 |  |  | 103,907 |  |  | $ | 17.81 |
Granted |  |  | 7,500 |  |  |  | 10.96 |
Vested |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |
Nonvested shares at March 31, 2015 |  |  | 111,407 |  |  | $ | 17.35 |

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