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EQUITY PLANS (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Plan Activity | Stock option activity under the 2010 Option Plan for the year ended December 31, 2020 is as follows:
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 31, 2019 | 109,564 |  |  | $ | 4.31 |  |  |  |  |
Exercised | (19,564) |  |  | $ | 4.31 |  |  |  |  |
Outstanding at December 31, 2020 | 90,000 |  |  | $ | 4.31 |  |  | 2.7 years |  | $ | 4.1 | million
Exercisable at December 31, 2020 | 90,000 |  |  | $ | 4.31 |  |  | 2.7 years |  | $ | 4.1 | million
Summary of RSU and PSU Activity | The following summary presents information of equity-classified RSU and PSU activity for the year ended December 31, 2020:
| Restricted Stock Units |  | Performance Stock Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2019 | 76,343 |  |  | 53,613 |  |  | $ | 28.57 |
Granted | 762,670 |  |  | 48,209 |  |  | 31.27 |
Vested | (422,962) |  |  | (53,617) |  |  | 26.17 |
Forfeited | (1,642) |  |  | (16,727) |  |  | 26.52 |
Outstanding at December 31, 2020 | 414,409 |  |  | 31,478 |  |  | $ | 36.12 |
The following summary presents liability-classified RSU activity for the year ended December 31, 2020:
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2019 | 9,572 |  |  | $ | 25.50 |
Vested and settled for cash | (9,572) |  |  | 25.50 |
Forfeited | — |  |  | 25.50 |
Outstanding at December 31, 2020 | — |  |  | $ | 25.50 |

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