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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2024
Stock-Based Compensation [Abstract] |
Stock-Based Compensation | 12.STOCK-BASED COMPENSATION Stock Options The following table summarizes the Company’s activities with respect to its stock option plans for the six months ended June 30, 2024 as follows (dollars and shares in thousands, except for per share data):
|  |  |  | Weighted- |  | Weighted-Average |  |  |
|  |  |  | Average |  | Remaining |  |  |
|  | Number |  | Exercise Price |  | Contractual |  | Aggregate
|  | of Shares |  | Per Share |  | Life (in years) |  | Intrinsic Value
Outstanding at December 31, 2023 |  | 1,340 |  | $ | 168.32 |  |  |  |  |
Exercised |  | (175) |  | $ | 130.19 |  |  |  |  |
Forfeited/canceled |  | (2) |  | $ | 197.91 |  |  |  |  |
Outstanding at June 30, 2024 |  | 1,163 |  | $ | 174.02 |  | 1.4 |  | $ | 27,996
Exercisable at June 30, 2024 |  | 1,140 |  | $ | 172.50 |  | 1.3 |  | $ | 27,996
Unvested at June 30, 2024 |  | 23 |  | $ | 252.81 |  | 8.6 |  | $ | —
The total intrinsic value for options exercised during the six months ended June 30, 2024 was $15.0 million. Restricted Stock Units and Performance-Based Restricted Stock Units The following table summarizes the Company’s RSU and PSU activity for the six months ended June 30, 2024:
|  | RSUs |  | PSUs (1)
|  |  |  | Weighted-Average |  |  |  | Weighted-Average
|  | Number of |  | Grant Date Fair |  | Number of |  | Grant Date Fair
|  | Shares |  | Value per Share |  | Shares |  | Value per Share
|  | (in thousands) |  |  |  |  | (in thousands) |  |  |
Outstanding at December 31, 2023 |  | 267 |  | $ | 269.08 |  | 368 |  | $ | 298.46
Granted |  | 267 |  | $ | 216.02 |  | 59 |  | $ | 291.51
PSU adjustment (2) |  | — |  | $ | — |  | 11 |  | $ | 236.63
Vested |  | (116) |  | $ | 270.65 |  | (155) |  | $ | 236.32
Forfeited/canceled |  | (9) |  | $ | 244.31 |  | (2) |  | $ | 377.74
Outstanding at June 30, 2024 |  | 409 |  | $ | 234.49 |  | 281 |  | $ | 314.04
(1)PSUs represent the target number of shares granted that are issuable at the end of the three year performance period. Fair value for a portion of the PSUs was calculated using a Monte Carlo simulation model. (2)PSU adjustment represents the net PSUs awarded above or below their target grants resulting from the achievement of performance targets established at the grant date.

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