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Stock Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule Of Stock-Based Compensation Expense

Stock-based compensation expense was as follows:

(In thousands)	2018				2017				2016
Restricted stock	$	6,221			$	4,691			$	3,456
Stock options	217				380				2,459
Performance stock	5,801				6,687				3,296
Total compensation expense before income taxes	12,239				11,758				9,211
Income tax benefit	2,974				4,440				3,375
Total compensation expense, net of income tax benefit	$	9,265			$	7,318			$	5,836

Schedule Of Fair Value Weighted Average Assumptions For Options Granted

Stock option expense is based on the fair value of stock option grants estimated on the grant dates using the Black-Scholes option pricing model and the following weighted average assumptions for options granted in 2016. There were no stock options granted in 2018 and 2017.

	2016
Fair value per option	$	11.69
Risk-free interest rate	1.6		%
Expected dividend yield	2.8		%
Expected volatility	34		%
Expected life (years)	7.0

Summary Of Option Activity

A summary of option activity follows:

	Shares			Weighted Average Exercise Price				Exercisable at Year-end
Outstanding January 1, 2016	1,694,675			$	36.69
Granted	235,233			44.50
Exercised	(341,063	)		37.34
Forfeited	(12,753	)		46.11
Outstanding December 31, 2016	1,576,092			37.63				1,098,615
Exercised	(620,646	)		29.75
Outstanding December 31, 2017	955,446			42.75				614,414
Exercised	(215,724	)		39.25
Forfeited	(4,721	)		44.50
Outstanding December 31, 2018	735,001			$	43.79			638,673

Characteristics of Outstanding and Exercisable Stock Options

For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2018 were as follows:

	Stock Options Outstanding
Range of Exercise Prices	Shares			Weighted-Average
				Exercise Price				Remaining Life
$17.83 – $33.00	39,485			$	25.01			0.90
$33.01 – $45.00	359,713			40.39				4.32
$45.01 – $51.69	335,803			49.64				4.65
$17.83 – $51.69	735,001			$	43.79			4.28

	Stock Options Exercisable
Range of Exercise Prices	Shares			Weighted-Average
				Exercise Price				Remaining Life
$17.83 – $33.00	39,485			$	25.01			0.90
$33.01 – $45.00	263,385			38.89				3.27
$45.01 – $51.69	335,803			49.64				4.65
$17.83 – $51.69	638,673			$	43.68			3.85

Summary of Restricted Stock and Unit Activity

A summary of restricted stock and unit activity follows:

	Shares			Weighted Average Grant Date Fair Value
Unvested January 1, 2016	217,709			$	49.70
Granted	107,465			50.65
Vested	(76,568	)		49.12
Forfeited	(14,014	)		48.23
Unvested at December 31, 2016	234,592			49.76
Granted	72,878			75.27
Vested	(76,834	)		52.74
Forfeited	(3,475	)		50.46
Unvested at December 31, 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

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, 2016	171,644			$	50.24
Granted	65,355			44.28
Vested	(31,093	)		58.54
Performance adjustments	(15,682	)		58.54
Forfeited	(3,603	)		44.47
Unvested at December 31, 2016	186,621			46.18
Granted	98,886			72.73
Vested	(72,504	)		57.19
Performance adjustments	29,183			57.27
Forfeited	—			—
Unvested at December 31, 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

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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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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