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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule Of Stock-Based Compensation Expense
Stock-based compensation expense was as follows:
(In thousands)
2016
 
2015
 
2014
Restricted stock
$
3,456

 
$
3,035

 
$
4,026

Stock options
2,459

 
2,454

 
2,355

Performance stock
3,296

 
2,110

 
2,672

Total compensation expense before income taxes
9,211

 
7,599

 
9,053

Income tax benefit
3,375

 
2,896

 
3,293

Total compensation expense, net of income tax benefit
$
5,836

 
$
4,703

 
$
5,760
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, 2015 and 2014.
 
2016
 
2015
 
2014
Fair value per option
$
11.69

 
$
15.63

 
$
17.26

Risk-free interest rate
1.6
%
 
1.8
%
 
2.1
%
Expected dividend yield
2.8
%
 
2.3
%
 
2.4
%
Expected volatility
34
%
 
39
%
 
41
%
Expected life (years)
7.0

 
6.7

 
6.6
Summary Of Option Activity
A summary of option activity follows:
 
Shares
 
Weighted
Average
Exercise Price
 
Exercisable at
Year-end
Outstanding January 1, 2014
1,695,380

 
$
34.55

 
 
Granted
138,519

 
51.69

 
 
Exercised
(190,743
)
 
36.31

 
 
Expired
(1,071
)
 
45.68

 
 
Forfeited
(23,524
)
 
38.82

 
 
Outstanding December 31, 2014
1,618,561

 
35.74

 
1,147,712

Granted
170,683

 
48.64

 
 
Exercised
(64,752
)
 
38.59

 
 
Expired
(1,109
)
 
44.36

 
 
Forfeited
(28,708
)
 
49.71

 
 
Outstanding December 31, 2015
1,694,675

 
36.69

 
1,280,665

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
Characteristics of Outstanding and Exercisable Stock Options
For various exercise price ranges, characteristics of outstanding and exercisable stock options at December 31, 2016 were as follows:
 
Stock Options Outstanding
Range of Exercise Prices
Shares
 
Weighted-Average
Exercise Price
 
Remaining Life
$17.83 – $33.00
456,938

 
$
21.66

 
2.64
$33.01 – $45.00
566,173

 
39.60

 
6.06
$45.01 – $51.69
552,981

 
48.82

 
5.69
$17.83 – $51.69
1,576,092

 
$
37.63

 
4.94
 
Stock Options Exercisable
Range of Exercise Prices
Shares
 
Weighted-Average
Exercise Price
 
Remaining Life
$17.83 – $33.00
456,938

 
$
21.66

 
2.64
$33.01 – $45.00
346,157

 
36.49

 
4.09
$45.01 – $51.69
295,520

 
47.84

 
3.91
$17.83 – $51.69
1,098,615

 
$
33.37

 
3.44
Summary of Restricted Stock and Unit Activity
A summary of restricted stock and unit activity follows:
 
Shares
 
Weighted Average
Grant Date
Fair Value
Unvested at January 1, 2014
303,419

 
$
39.79

Granted
83,543

 
51.91

Vested
(108,245
)
 
34.94

Forfeited
(9,974
)
 
44.42

Unvested at December 31, 2014
268,743

 
45.34

Granted
83,725

 
48.06

Vested
(111,834
)
 
39.01

Forfeited
(22,925
)
 
45.84

Unvested at December 31, 2015
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
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, 2014
149,389

 
$
46.32

Granted
46,242

 
57.42

Vested
(91,696
)
 
39.19

Performance adjustments
41,428

 
39.42

Forfeited
(1,402
)
 
48.85

Unvested at December 31, 2014
143,961

 
52.42

Granted
87,256

 
41.99

Vested
(66,200
)
 
41.75

Performance adjustments
16,447

 
41.45

Forfeited
(9,820
)
 
51.51

Unvested at December 31, 2015
171,644

 
50.24

Granted
65,355

 
44.28

Vested
(31,181
)
 
58.54

Performance adjustments
(15,594
)
 
58.54

Forfeited
(3,603
)
 
44.47

Unvested at December 31, 2016
186,621

 
$
46.18