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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock-Based Compensation Plans |
Summary of certain information concerning outstanding and exercisable options | We granted to key employees equity awards consisting of RSUs and PSUs in aggregate amounts as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | RSUs Vesting
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | December 1,
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and
​ | ​ | ​ | ​ | ​ |  | RSU and PSU | ​ | Grant Date | ​ | PSUs Vesting
​ |  | RSUs |  | PSUs |  | Aggregate Units |  | Fair Value |  | December 31,
2023 | ​ | 109,683 | ​ | 84,129 | ​ | 193,812 | ​ | $ | 247.90 | ​ | 2025
2022 | ​ | 192,798 | ​ | 112,451 | ​ | 305,249 | ​ | $ | 187.31 | ​ | 2024
2021 | ​ | 191,139 | ​ | 127,356 | ​ | 318,495 | ​ | $ | 141.41 | ​ | 2023
Summary of the status of the Company's restricted stock units and changes during the quarter | A summary of the status of our unvested RSUs and PSUs as of December 31, 2023 and changes during the year then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | RSU and PSU | ​ | Grant Date
​ | ​ | Aggregate Units | ​ | Fair Value
Unvested at January 1, 2023 | ​ | 582,012 | ​ | $ | 164.60
Granted | ​ | 193,812 | ​ | ​ | 247.90
Vested | ​ | (310,485) | ​ | ​ | 146.27
Cancelled or forfeited | ​ | (28,100) | ​ | ​ | 187.55
Unvested at December 31, 2023 | ​ | 437,239 | ​ | $ | 213.06
Shares reserved for future grants (all plans) | ​ | 1,539,738 | ​ | ​ | ​

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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 option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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