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Stock-Based Compensation (Tables)

12 Months Ended

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.

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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

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