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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Changes in Outstanding Stock Options | Stock options outstanding at December 31, 2021 and changes during the year ended December 31, 2021 are as follows:
| December 31, 2021
| 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, 2021 | 7,425 |  |  | $ | 19.48 |  |  |  |  |
Converted sub-equity options | 3 |  |  | 37.49 |  |  |  |  |
Increase due to acquisition | 267 |  |  | 30.30 |  |  |  |  |
Exercised | (2,926) |  |  | 18.52 |  |  |  |  |
Forfeited | (280) |  |  | 23.06 |  |  |  |  |
Expired | (21) |  |  | 12.55 |  |  |  |  |
Outstanding at December 31, 2021 | 4,468 |  |  | $ | 20.58 |  |  | 4.9 |  | $ | 498,936 |
Options exercisable | 4,193 |  |  | $ | 19.85 |  |  | 4.7 |  | $ | 471,347 |
______________________
Schedule of Stock Options Outstanding and Exercisable | The following table summarizes the information about stock options outstanding and exercisable at December 31, 2021:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Outstanding at December 31, 2021 |  | Weighted- Average Remaining Contractual Life in Years |  | Weighted-Average Exercise Price |  | Exercisable at December 31, 2021 |  | Weighted- Average Remaining Contractual Life in Years |  | Weighted-Average Exercise Price
| (Shares in thousands)
$0.01 to $10.00 | 671 |  |  | 4.6 |  | $ | 7.92 |  |  | 631 |  |  | 4.3 |  | $ | 8.38 |
$10.01 to $20.00 | 1,545 |  |  | 4.4 |  | 14.78 |  |  | 1,544 |  |  | 4.4 |  | 14.78 |
$20.01 to $30.00 | 1,794 |  |  | 4.9 |  | 24.62 |  |  | 1,698 |  |  | 4.9 |  | 24.37 |
$30.01 to $40.00 | 152 |  |  | 6.1 |  | 35.58 |  |  | 147 |  |  | 6.1 |  | 35.76 |
$40.01 to $50.00 | 306 |  |  | 7.6 |  | 46.49 |  |  | 173 |  |  | 6.2 |  | 49.12 |
| 4,468 |  |  | 4.9 |  | $ | 20.58 |  |  | 4,193 |  |  | 4.7 |  | $ | 19.85 |
Schedule of Restricted Stock Units and Performance Stock Units | Unvested RSUs, PSUs, and market-based awards outstanding at December 31, 2021 and changes during the year ended December 31, 2021 are as follows:
| RSUs |  | PSUs |  | Market-based awards
| 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, 2021 | 3,299 |  |  | $ | 63.02 |  |  | 550 |  |  | $ | 74.59 |  |  | 714 |  |  | $ | 19.34 |
Granted | 1,452 |  |  | 157.61 |  |  | 212 |  |  | 159.23 |  |  | 803 |  |  | 159.67 |
Vested | (1,195) |  |  | 56.46 |  |  | — |  |  | — |  |  | (559) |  |  | 19.81 |
Forfeited | (436) |  |  | 93.27 |  |  | (221) |  |  | 97.42 |  |  | (146) |  |  | 148.66 |
Expired | — |  |  | — |  |  | — |  |  | — |  |  | (30) |  |  | 20.84 |
Unvested at December 31, 2021 | 3,120 |  |  | $ | 105.33 |  |  | 541 |  |  | $ | 98.41 |  |  | 782 |  |  | $ | 138.95 |
______________________ (a)Represents the maximum shares issuable.

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