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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2021
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 three months ended March 31, 2021 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, 2020 |  | 3,202 |  | $ | 143.01 |  |  |  |  |
Exercised |  | (70) |  | $ | 122.72 |  |  |  |  |
Forfeited/canceled |  | (7) |  | $ | 173.81 |  |  |  |  |
Outstanding at March 31, 2021 |  | 3,125 |  | $ | 143.39 |  | 3.5 |  | $ | 419,128
Exercisable at March 31, 2021 |  | 2,371 |  | $ | 132.98 |  | 3.2 |  | $ | 342,849
Unvested at March 31, 2021 |  | 754 |  | $ | 176.21 |  | 4.7 |  | $ | 76,279
The total intrinsic value for options exercised during the three months ended March 31, 2021 was $9.5 million. Restricted Stock Units and Performance-Based Restricted Stock Units The following table summarizes the Company’s RSU and PSU activity for the three months ended March 31, 2021:
|  | RSUs |  | PSUs
|  |  |  | 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, 2020 (1) |  | 274 |  | $ | 206.48 |  | 148 |  | $ | 376.48
Granted (1) |  | 101 |  | $ | 235.92 |  | 153 |  | $ | 236.48
Vested |  | (122) |  | $ | 185.34 |  | — |  | $ | —
Forfeited/canceled |  | (3) |  | $ | 224.37 |  | (1) |  | $ | 376.50
Outstanding at March 31, 2021 |  | 250 |  | $ | 228.47 |  | 300 |  | $ | 304.80
(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.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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