Stock Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock-Based Compensation Expense

Stock-based compensation expense was as follows:

(In thousands)	2023		2022		2021
Restricted stock units	$	8,062	$	6,488	$	5,797
Stock options	—		49		81
Performance stock units	21,961		13,113		13,030
Total stock-compensation expense before income taxes	30,023		19,650		18,908
Income tax benefit	7,356		4,814		4,633
Total stock-compensation expense, net of income tax benefit	$	22,667	$	14,836	$	14,275

Summary of Option Activity

A summary of option activity follows:

	Shares	Weighted Average Exercise Price		Exercisable at Year-end
Outstanding January 1, 2021	283,998	$	46.23
Exercised	(122,087)	47.25
Forfeited	(210)	43.75
Outstanding December 31, 2021	161,701	45.47		161,347
Exercised	(103,545)	44.91
Outstanding December 31, 2022	58,156	46.48		58,156
Exercised	(31,394)	46.90
Forfeited	(226)	49.44
Outstanding December 31, 2023	26,536	$	45.95	26,536

Characteristics of Outstanding and Exercisable Stock Options

For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2023 were as follows:

	Stock Options Outstanding and Exercisable
Range of Exercise Prices	Shares	Weighted-Average
		Exercise Price		Remaining Life
$33.01 – $45.00	17,820	$	44.50	1.66
$45.01 – $57.93	8,716	48.92		1.73
$33.01 – $57.93	26,536	$	45.95	1.68

Summary of Restricted Stock Unit Activity

A summary of restricted stock unit activity follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested January 1, 2021	146,191	$	105.83
Granted	43,146	167.13
Vested	(65,225)	95.43
Forfeited	(5,769)	132.54
Unvested at December 31, 2021	118,343	132.62
Granted	87,697	130.28
Vested	(51,369)	113.96
Forfeited	(8,785)	139.66
Unvested at December 31, 2022	145,886	137.36
Granted	81,150	142.92
Vested	(43,107)	126.27
Forfeited	(10,078)	140.28
Unvested at December 31, 2023	173,851	$	142.73

Summary of Performance Stock Unit Activity

A summary of performance stock unit activity follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested at January 1, 2021	200,212	$	104.69
Granted	52,309	175.59
Vested	(64,543)	85.41
Performance adjustments	5,357	88.45
Unvested at December 31, 2021	193,335	129.86
Granted	81,504	142.38
Vested	(55,447)	101.38
Performance adjustments	(22,147)	99.84
Forfeited	(18,485)	147.66
Unvested at December 31, 2022	178,760	146.28
Granted	77,654	132.39
Vested	(53,407)	127.36
Performance adjustments	(3,009)	127.40
Forfeited	(10,777)	147.06
Unvested at December 31, 2023	189,221	$	146.17