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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Stock-Based Compensation Plans |
Schedule of key employees equity awards of RSUs and PSUs | We granted to key employees equity awards consisting of RSUs and PSUs in aggregate amounts as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | RSUs Vesting
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | December 1,
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Grant Date | ​ | and
​ | ​ | ​ | ​ | ​ |  | RSU and PSU | ​ | Fair Value | ​ | PSUs Vesting
​ |  | RSUs |  | PSUs |  | Aggregate Units |  | Per Unit |  | December 31,
2024 | ​ | 101,056 | ​ | 70,522 | ​ | 171,578 | ​ | $ | 289.19 | ​ | 2026
2023 | ​ | 109,683 | ​ | 84,129 | ​ | 193,812 | ​ | $ | 247.90 | ​ | 2025
2022 | ​ | 192,798 | ​ | 112,451 | ​ | 305,249 | ​ | $ | 187.31 | ​ | 2024
Summary of the status of the Company's restricted stock units and changes during the year | A summary of the status of our unvested RSUs and PSUs as of December 31, 2024 and changes during the year then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | RSU and PSU | ​ | Fair Value
​ | ​ | Aggregate Units | ​ | Per Unit
Unvested at January 1, 2024 | ​ | 437,239 | ​ | $ | 213.06
Granted | ​ | 171,578 | ​ | ​ | 289.19
Vested | ​ | (233,982) | ​ | ​ | 186.89
Cancelled or forfeited | ​ | (47,818) | ​ | ​ | 238.85
Unvested at December 31, 2024 | ​ | 327,017 | ​ | $ | 267.96
Shares reserved for future grants (all plans) | ​ | 1,412,203 | ​ | ​ | ​

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock and restricted stock units. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance-based restricted stock units and service-based restricted stock units. + References No definition available. + Details
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