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Equity Incentive Plan (Tables)

9 Months Ended

Sep. 30, 2025

Equity Incentive Plan

Schedule of restricted share activity

Restricted share activity is summarized as follows:

​

​	​	​	​	​	​
​		Shares		Weighted Average
​	​	Outstanding	​	Grant Date
​	​	(in thousands)	​	Fair Value
Unvested restricted stock at December 31, 2024		218	​	$	63.65
Restricted stock granted		84	​	​	72.83
Restricted stock vested	​	(92)	​	​	65.43
Restricted stock forfeited		(16)	​	​	65.48
Unvested restricted stock at September 30, 2025		194	​	$	66.65

Schedule of valuation assumptions used

The following assumptions were used when determining the grant date fair value:

​	​	​	​	​	​	​	​
​	​	​	2025		​	2024
Expected term (years)	​	​	2.9	​	​	2.9	​
Volatility	​	​	19.6	%	​	20.0	%
Risk-free rate	​	​	4.2	%	​	4.5	%

Schedule of performance share and unit activity

Performance units activity is summarized as follows:

​	​	​	​	​	​
​		Target Number		Weighted Average
​	​	of Awards	​	Grant Date
​	​	(in thousands)	​	Fair Value
Performance units and shares - three-year performance period to be completed at December 31, 2024	​	157	​	$	67.50
Performance units granted	​	90	​	​	79.61
Performance units - three-year performance period completed	​	(34)	​	​	68.59
Performance units and shares - three-year performance period to be completed at September 30, 2025	​	213	​	$	72.42

​

​

​	​	​	​	​
​	Shares		Weighted Average
​	Outstanding	​	Grant Date
​	(in thousands)	​	Fair Value
Performance shares - three-year performance period completed but not yet vested at December 31, 2024	26	​	$	74.58
Shares earned at completion of three-year performance period (1)	51	​	​	68.59
Shares vested	(35)	​	​	74.13
Performance shares - three-year performance period completed but not yet vested at September 30, 2025	42	​	$	67.64

​

(1) Performance units granted in 2022 for which the three-year performance period was completed in 2025 were earned at the 150% performance level.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, 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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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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