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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2019
STOCK-BASED COMPENSATION |
Summary of Stock Options Outstanding | The following table summarizes stock options outstanding and changes for the three-month periods ending March 31, 2019 and 2018:
|  | March 31, 2019 |  | March 31, 2018
|  |  |  | Weighted |  |  |  | Weighted
|  | Number of |  | Average |  | Number of |  | Average
|  | Stock |  | Exercise |  | Stock |  | Exercise
|  | Options |  | Price |  | Options |  | Price
Stock options outstanding at beginning of period |  | 19,170 |  | $ | 79.78 |  | 5,723 |  | $ | 276.50
Granted |  | — |  |  | — |  | — |  |  | —
Expired |  | (280) |  |  | 179.68 |  | (112) |  |  | 624.00
Stock options outstanding at end of period |  | 18,890 |  | $ | 78.21 |  | 5,611 |  | $ | 269.50
Stock options exercisable at end of period |  | 18,890 |  | $ | 78.21 |  | 1,828 |  | $ | 682.50
Summary of Stock Options Outstanding and Exercisable by Stock Option Plan | The following table summarizes stock options outstanding and exercisable by stock option plan at March 31, 2019:
|  | Outstanding Stock Options |  | Exercisable Stock Options
|  | Number of |  | Weighted |  | Number of |  | Weighted
|  | Outstanding |  | Average |  | Exercisable |  | Average
Stock Option Plan |  | Stock Options |  | Exercise Price |  | Stock Options |  | Exercise Price
2004 Plan |  | 96 |  | $ | 1,752.25 |  | 96 |  | $ | 1,752.25
2004 Directors’ Plan |  | 11 |  |  | 9,332.73 |  | 11 |  |  | 9,332.73
2013 Plan |  | 12,766 |  |  | 35.41 |  | 12,766 |  |  | 35.41
Replacement Stock Options-Alabama Graphite |  | 5,568 |  |  | 80.96 |  | 5,568 |  |  | 80.96
Replacement Stock Options-Anatolia Energy |  | 449 |  |  | 676.22 |  | 449 |  |  | 676.22
|  | 18,890 |  | $ | 78.21 |  | 18,890 |  | $ | 78.21
Summary of Status of Non-vested Restricted Shares | The following table summarizes RSU activity for the three-month periods ended March 31, 2019 and 2018:
|  | March 31, |  | March 31,
|  | 2019 |  | 2018
|  |  |  | Weighted- |  |  |  | Weighted-
|  |  |  | Average |  |  |  | Average
|  | Number of |  | Grant Date |  | Number of |  | Grant Date
|  | RSUs |  | Fair Value |  | RSUs |  | Fair Value
Unvested RSUs at beginning of period |  | 2,260 |  | $ | 70.00 |  | 3,578 |  | $ | 70.00
Granted |  | — |  |  | — |  | — |  |  | —
Forfeited |  | (565) |  |  | 70.00 |  | (189) |  |  | 70.00
Vested |  | — |  |  | — |  | — |  |  | —
Unvested RSUs at end of period |  | 1,695 |  | $ | 70.00 |  | 3,389 |  | $ | 70.00

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