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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Changes in Outstanding Stock Options | Stock options and stock appreciation rights outstanding at December 31, 2020 and changes during the year ended December 31, 2020 were as follows:
| December 31, 2020
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (In Years) |  | Aggregate Intrinsic Value
| (Shares and intrinsic value in thousands)
Outstanding at January 1, 2020 | 23,984 |  |  | $ | 3.89 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (12,931) |  |  | 3.18 |  |  |  |  |
Forfeited | (352) |  |  | 6.16 |  |  |  |  |
Expired | (12) |  |  | 15.03 |  |  |  |  |
Outstanding at December 31, 2020 | 10,689 |  |  | $ | 4.67 |  |  | 5.68 |  | $ | 92.08 |
Exercisable | 8,944 |  |  | $ | 4.59 |  |  | 5.59 |  | $ | 77.97 |
Schedule of Information for Stock Options Outstanding and Exercisable | The following table summarizes the information about stock options and stock appreciation rights outstanding and exercisable at December 31, 2020:
|  | Awards Outstanding |  | Awards Exercisable
Range of Exercise Prices |  | Outstanding at December 31, 2020 |  | Weighted average remaining contractual life in years |  | Weighted average exercise price |  | Exercisable at December 31, 2020 |  | Weighted average remaining contractual life in years |  | Weighted average exercise price
|  | (Shares in thousands)
$0.01 to $3.00 |  | 2,864 |  |  | 4.9 |  | $ | 2.29 |  |  | 2,864 |  |  | 4.9 |  | $ | 2.29 |
$3.01 to $6.00 |  | 6,814 |  |  | 6.1 |  | 4.53 |  |  | 5,213 |  |  | 6.1 |  | 4.53 |
$6.01 to $9.00 |  | 106 |  |  | 4.0 |  | 8.04 |  |  | 106 |  |  | 4 |  | 8.04 |
$9.01 to $12.00 |  | 405 |  |  | 6.0 |  | 10.54 |  |  | 324 |  |  | 5.7 |  | 10.47 |
$12.01 to $15.00 |  | 369 |  |  | 5.5 |  | 12.94 |  |  | 306 |  |  | 5.3 |  | 12.98 |
$15.01 to $18.00 |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
$18.01 to$21.00 |  | 115 |  |  | 2.2 |  | 19.88 |  |  | 115 |  |  | 2.2 |  | 19.88 |
$21.01 to $24.00 |  | 16 |  |  | 2.6 |  | 22.02 |  |  | 16 |  |  | 2.6 |  | 22.02 |
|  | 10,689 |  |  | 5.7 |  | $ | 4.67 |  |  | 8,944 |  |  | 5.6 |  | $ | 4.59 |
Schedule of Outstanding Unvested RSUs | Unvested RSUs, MSUs and PSUs outstanding at December 31, 2020 and changes during the year ended December 31, 2020 are as follows:
| RSUs |  | MSUs |  | PSUs
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Number of Shares (a) |  | Weighted Average Grant Date Fair Value |  | Number of Shares (a) |  | Weighted Average Grant Date Fair Value
| (Shares in thousands)
Unvested at January 1, 2020 | 5,660 |  |  | $ | 15.29 |  |  | 3,503 |  |  | $ | 3.62 |  |  | 881 |  |  | $ | 15.89 |
Granted | 6,962 |  |  | 7.37 |  |  | — |  |  | — |  |  | 1,844 |  |  | 6.92 |
Vested | (2,128) |  |  | 13.78 |  |  | (738) |  |  | 6.8 |  |  | — |  |  | — |
Forfeited | (934) |  |  | 11.93 |  |  | (269) |  |  | 6.8 |  |  | (767) |  |  | 16.4 |
Unvested at December 31, 2020 | 9,560 |  |  | $ | 10.19 |  |  | 2,496 |  |  | $ | 7.82 |  |  | 1,958 |  |  | $ | 5.11 |
___________________________ (a) Included in the table are MSUs and PSUs which vests in varying amounts depending upon certain market or performance conditions. The MSUs and PSUs in the table above includes these awards at their maximum potential payout.

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