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Stock option and award plan: (Tables)

12 Months Ended

Dec. 31, 2024

Stock option and award plan:

Schedule of assumptions used for determining the fair value of options granted

​

​	​	​	​	​	​	​	​
​	​	Years Ended
​	​	December 31,					​
Black-Scholes Assumptions		2024		2023		2022
Dividend yield		6.0	%	5.8	%	5.9	%
Expected volatility		34.9	%	33.4	%	33.1	%
Risk-free interest rate		4.1	%	3.8	%	3.0	%
Expected life of the option term (in years)		4.1	​	4.1	​	4.1	​

Schedule of stock option activity

​

​	​	​	​	​	​
​		Number of		Weighted-Average
​		Options		Exercise Price
Outstanding at December 31, 2023		198,775	​	$	61.97
Granted		120,784	​	$	70.21
Cancelled and expired		(62,138)	​	$	66.05
Exercised—intrinsic value $0.5 million; cash received $1.2 million		(36,465)	​	$	60.45
Outstanding at December 31, 2024—$2.7 million intrinsic value and 7.7 years weighted-average remaining contractual term		220,956	​	$	65.58
Exercisable at December 31, 2024—$1.5 million intrinsic value and 6.1 years weighted-average remaining contractual term		95,330	​	$	62.15
Expected to vest—$2.3 million intrinsic value and 7.4 years weighted-average remaining contractual term		183,864	​	$	64.94

Schedule of non-vested restricted stock awards

​

​	​	​	​	​	​
​	​	​	​	Weighted-Average
​	​	​	​	Grant Date
Non-vested awards		Shares		Fair Value
Non-vested at December 31, 2023		1,261,623	​	$	62.89
Granted		672,098	​	$	68.58
Vested		(315,559)	​	$	66.11
Forfeited		(128,885)	​	$	66.66
Non-vested at December 31, 2024		1,489,277	​	$	64.45

​

​	​	​	​	​	​	​	​	​	​
​		Years Ended
​		December 31,
Additional Award Plan Information – Related to Stock Options & Restricted Stock (thousands)		2024			2023			2022
Equity-based compensation expense	​	$	25,738	​	$	26,924	​	$	24,439
Income tax benefit related to stock options and restricted stock	​		2,469	​		3,307	​		2,489
Capitalized compensation expense related to stock options and restricted stock	​		3,100	​		3,541	​		2,277
Intrinsic value of stock options exercised	​		573	​		456	​		305
Fair value of shares of restricted stock vested	​		22,489	​		30,113	​		25,792

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Tabular disclosure of the changes in outstanding nonvested shares.

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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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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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