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Stock Options and Stock Appreciation Rights (Tables)

12 Months Ended

Dec. 31, 2024

Stock Options and Stock Appreciation Rights

Summary of option activity under stock option plans

​

​	​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted			​	​
​	​	​	​	Weighted		​	average	​	​	​	​
​	​	​	​	average		​	remaining	​	Aggregate		​
​	​	Number of	​	exercise		​	contractual	​	intrinsic		​
​	​	options	​	price		​	term (years)	​	value ($)		​
​	​	​	​	​	​	​	​	​	(in Thousands)		​
Options outstanding at December 31, 2023		383,865	​	$	30.65	​	​	​	​	​	​
Plus: Options granted		—	​	​	—	​	​	​	​	​	​
Less:	​	​	​	​	​	​	​	​	​	​	​
Options exercised		(149,773)	​	​	25.08	​	​	​	​	​	​
Options expired		—	​	​	—	​	​	​	​	​	​
Options forfeited		(21,937)	​	​	23.93	​	​	​	​	​	​
Options outstanding at December 31, 2024		212,155	​		35.27		4.13	​	$	5,918	​
​	​	​	​	​	​	​	​	​	​	​	​
Options fully vested and exercisable at December 31, 2024		121,714	​	$	35.92		3.31	​	$	3,316	​

Schedule of other information pertaining to option activity

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Twelve Months Ended December 31,
​	​	2024		​	2023		​	2022
Weighted average grant date fair value of stock options granted		$	—		$	—		$	11.24	​
Total fair value of stock options vested	​	$	616,286	​	$	514,000	​	$	514,000	​
Total intrinsic value of stock options exercised	​	$	4,640,000	​	$	1,060,000	​	$	1,670,000	​

Summary of activity under the SAR Plan

​

​	​	​	​	​	​	​	​	​	​	​
​		​		​	​		Weighted			​
​	​	​	​	Weighted		​	average	​	​	​
​	​	Number of	​	average		​	remaining	​	Aggregate
​	​	stock appreciation	​	exercise		​	contractual	​	intrinsic
​	​	rights	​	price		​	term (years)	​	value ($)
​	​	​	​	​	​	​	​	​	(in Thousands)
SARs outstanding at December 31, 2023		465,250	​	$	39.35	​	​	​	​	​
Plus: SARs granted		8,000	​	​	53.91	​	​	​	​	​
Less:	​	​	​	​	​	​	​	​	​	​
SARs exercised		(2,548)	​	​	39.33	​	​	​	​	​
SARs expired		—	​	​	—	​	​	​	​	​
SARs forfeited		(14,000)	​	​	39.33	​	​	​	​	​
SARs outstanding at December 31, 2024		456,702	​		39.61		7.54	​	$	10,757
​	​	​	​	​	​	​	​	​	​	​
SARs fully vested and exercisable at December 31, 2024		22,435	​	$	39.35		7.50	​	$	534

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Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year.

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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