Stock Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule Of Stock-Based Compensation Expense

Stock-based compensation expense was as follows:

(In thousands)	2020		2019		2018
Restricted stock units	$	6,258	$	6,914	$	6,221
Stock options	113		487		217
Performance stock units	549		6,359		5,801
Total stock-compensation expense before income taxes	6,920		13,760		12,239
Income tax benefit	1,668		3,357		2,974
Total stock-compensation expense, net of income tax benefit	$	5,252	$	10,403	$	9,265

Schedule Of Fair Value Weighted Average Assumptions For Options Granted

the following weighted average assumptions. There were no stock options granted in 2020 or 2018.

	2019
Fair value per option	$	59.07
Risk-free interest rate	2.3		%
Expected dividend yield	1.7		%
Expected volatility	31		%
Expected life (years)	6.4

Summary Of Option Activity

A summary of option activity follows:

	Shares	Weighted Average Exercise Price		Exercisable at Year-end
Outstanding January 1, 2018	955,446	$	42.75
Exercised	(215,724)	39.25
Forfeited	(4,721)	44.50
Outstanding December 31, 2018	735,001	43.79		638,673
Granted	23,285	43.54
Exercised	(198,535)	38.16
Forfeited	(95)	49.19
Outstanding December 31, 2019	559,656	45.78		552,682
Exercised	(274,704)	45.31
Forfeited	(954)	42.00
Outstanding December 31, 2020	283,998	$	46.23	281,593

Characteristics of Outstanding and Exercisable Stock Options

For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2020 were as follows:

	Stock Options Outstanding
Range of Exercise Prices	Shares	Weighted-Average
		Exercise Price		Remaining Life
$33.01 – $45.00	158,836	43.88		3.06
$45.01 – $57.93	125,162	49.22		2.93
$33.01 – $57.93	283,998	$	46.23	3.00

	Stock Options Exercisable
Range of Exercise Prices	Shares	Weighted-Average
		Exercise Price		Remaining Life
$33.01 – $45.00	158,208	43.90		3.05
$45.01 – $57.93	123,385	49.22		2.87
$33.01 – $57.93	281,593	$	46.23	2.97

Summary of Restricted Stock and Unit Activity

A summary of restricted stock unit activity follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested January 1, 2017	227,161	$	57.50
Granted	75,430	87.36
Vested	(92,401)	58.10
Forfeited	(4,741)	59.61
Unvested at December 31, 2018	205,449	68.97
Granted	70,160	104.53
Vested	(97,253)	56.47
Forfeited	(5,655)	85.48
Unvested at December 31, 2019	172,701	90.38
Granted	51,468	124.61
Vested	(70,399)	81.58
Forfeited	(7,579)	106.54
Unvested at December 31, 2020	146,191	$	105.83

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, 2017	242,186	$	55.06
Granted	62,775	84.79
Vested	(41,660)	40.23
Performance adjustments	(35,756)	45.21
Forfeited	(8,659)	44.53
Unvested at December 31, 2018	218,886	68.43
Granted	83,819	101.03
Vested	(139,478)	44.75
Performance adjustments	76,960	44.24
Forfeited	(2,152)	99.82
Unvested at December 31, 2019	238,035	85.39
Granted	67,479	127.48
Vested	(132,036)	73.00
Performance adjustments	33,499	72.36
Forfeited	(6,765)	111.60
Unvested at December 31, 2020	200,212	$	104.69