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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2025
Restricted Stock and Restricted Stock Units |
Summary of information about nonvested stock option awards and changes | The following table summarizes activity under our restricted stock plans (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, 2025 | ​
​ | ​ | ​ | ​ | Weighted- | ​
​ | ​ | ​ | ​ | Average Grant | ​
Restricted Stock and Restricted Stock Units | ​ ​ ​ | Shares | ​ ​ ​ | Date Fair Value |
Unvested at beginning of year |  | 79 | ​ | $ | 187.33 | ​
Granted |  | 24 | ​ | $ | 378.49 | ​
Vested |  | (45) | ​ | $ | 185.65 | ​
Forfeited |  | — | ​ | $ | — | ​
Unvested at end of year |  | 58 | ​ | $ | 269.97 | ​
Performance Stock Units |
Schedule of fair values of the total shareholder return portion | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2025 | ​ | 2025 PSU Grant | ​ | 2024 PSU Grant
Risk-free interest rate | ​ | 3.4 | % | ​ | 3.5 | %
Dividend yield | ​ | 0.3 | % | ​ | 0.3 | %
Volatility | ​ | 53.7 | % | ​ | 61.4 | %
Look-back period (in years) | ​ | 2.0 | ​ | ​ | 1.0 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2024 | ​ | 2024 PSU Grant | ​ | 2023 PSU Grant
Risk-free interest rate | ​ | 4.2 | % | ​ | 4.1 | %
Dividend yield | ​ | 0.3 | % | ​ | 0.3 | %
Volatility | ​ | 40.2 | % | ​ | 44.9 | %
Look-back period (in years) | ​ | 2.0 | ​ | ​ | 1.0 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2023 | ​ | 2023 PSU Grant | ​ | ​ | 2022 PSU Grant | ​
Risk-free interest rate | ​ | 4.2 | % | ​ | 4.7 | %
Dividend yield | ​ | 0.5 | % | ​ | 0.5 | %
Volatility | ​ | 35.0 | % | ​ | 35.1 | %
Look-back period (in years) | ​ | 2.0 | ​ | ​ | 1.0 | ​

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance stock units, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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