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Stock Based Compensation | 3 Months Ended
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Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Based Compensation | 13. Stock-Based Compensation — The following tables illustrate the Company’s stock-based compensation, unamortized stock-based compensation, and remaining weighted average amortization period.
|  | Stock-Based Compensation for the Three months Period |  |  | Unamortized Stock-Based Compensation as of March 31 |  |  | Remaining Weighted Average Period (years) |
March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Time-Based Restricted Stock |  | $ | 1,057 |  |  | $ | 5,703 |  |  |  | 1.8 |
Unrestricted Stock |  |  | 110 |  |  |  | 73 |  |  |  | 0.2 |
Performance-Based Restricted Stock |  |  | 625 |  |  |  | 2,698 |  |  |  | 1.8 |
Total |  | $ | 1,792 |  |  | $ | 8,474 |  |  |  |  |
March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Time-Based Restricted Stock |  | $ | 776 |  |  | $ | 4,555 |  |  |  | 1.5 |
Unrestricted Stock |  |  | 123 |  |  |  | 82 |  |  |  | 0.2 |
Performance-Based Restricted Stock |  |  | 458 |  |  |  | 2,288 |  |  |  | 1.7 |
Total |  | $ | 1,357 |  |  | $ | 6,925 |  |  |  |  |
The Company also granted stock options in past periods. All outstanding stock options are fully vested and exercisable and no expense was recorded during the three months ended March 31, 2021 and 2020. Restricted and Unrestricted Stock — A summary of nonvested time based restricted and unrestricted stock is presented below:
|  | Three Months Ended March 31, 2021 |  |  | Three Months Ended March 31, 2020 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested shares at December 31st |  |  | 820,624 |  |  | $ | 16.64 |  |  |  | 719,845 |  |  | $ | 17.67 |
Granted |  |  | — |  |  |  | — |  |  |  | 4,185 |  |  |  | 18.63 |
Vested |  |  | (197,615 | ) |  |  | 19.91 |  |  |  | (213,781 | ) |  |  | 16.18 |
Forfeited |  |  | (11,580 | ) |  |  | 16.95 |  |  |  | (14,715 | ) |  |  | 18.08 |
Nonvested shares at March 31st |  |  | 611,429 |  |  | $ | 15.57 |  |  |  | 495,534 |  |  | $ | 18.31 |
Performance-Based Restricted Stock — A summary of nonvested performance-based stock is presented below:
|  | Three Months Ended March 31, 2021 |  |  | Three Months Ended March 31, 2020 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested shares at December 31st |  |  | 391,771 |  |  | $ | 16.26 |  |  |  | 345,432 |  |  | $ | 16.92 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Additional granted based on performance achievement |  |  | 71,180 |  |  |  | 20.53 |  |  |  | 76,445 |  |  |  | 16.56 |
Vested |  |  | (175,087 | ) |  |  | 19.78 |  |  |  | (184,785 | ) |  |  | 15.87 |
Forfeited |  |  | (505 | ) |  |  | 19.26 |  |  |  | (3,759 | ) |  |  | 17.23 |
Nonvested shares at March 31st |  |  | 287,359 |  |  | $ | 15.16 |  |  |  | 233,333 |  |  | $ | 17.63 |
Stock Options — The Company has stock options outstanding under its incentive stock option plans and performance incentive stock option plan. All outstanding stock options are vested and exercisable. The following tables present details for each type of plan: Incentive Stock Option Plans Activity of the incentive stock option plans:
|  | Number of Shares |  |  | Weighted Average Price Per Share |
Balance outstanding, December 31, 2020 |  |  | 123,087 |  |  | $ | 11.48 |
Options exercised |  |  | (5,838 | ) |  |  | 11.49 |
Balance outstanding, March 31, 2021 |  |  | 117,249 |  |  | $ | 11.48 |
Outstanding at March 31, 2021, summarized by exercise price:
|  | Outstanding Weighted Average |
Exercise Price Per Share |  | Shares |  |  | Remaining Life (Months) |  |  | Exercise Price |
Incentive Stock Option Plan: |  |  |  |  |  |  |  |  |  |  |  |
$11.32 |  |  | 7,200 |  |  |  | 3 |  |  | $ | 7.5 |
$14.49 |  |  | 110,049 |  |  |  | 45 |  |  | $ | 11.49 |
|  |  | 117,249 |  |  |  |  |  |  | $ | 11.48 |
Performance Incentive Stock Option Plan Activity of the performance incentive stock option plan:
|  | Number of Shares |  |  | Weighted Average Price Per Share |
Balance outstanding, December 31, 2020 |  |  | 114,658 |  |  | $ | 11.49 |
Options exercised |  |  | — |  |  |  | — |
Balance outstanding, March 31, 2021 |  |  | 114,658 |  |  | $ | 11.49 |
All the performance incentive stock options outstanding as of March 31, 2021 have an exercise price per share of $11.49 and a remaining life of 45 months.

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