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Stock Option And Stock Award Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary Of Stock Options Outstanding
A summary of stock options outstanding at December 31, 2017, 2016 and 2015, and changes during those years, is presented below:
 
 
 
Option Exercise Price/Share
  
Number of
Options
 
Range
 
Weighted
Average
Outstanding at January 1, 2015
1,164,120

 
$
14.06

 
to
 
$
30.01

 
$
19.59

Granted
—

 
—

 
to
 
—

 
—

Forfeited and expired
(60,207
)
 
17.13

 
to
 
30.01

 
22.30

Exercised
(222,400
)
 
14.06

 
to
 
19.84

 
16.34

Outstanding at December 31, 2015
881,513

 
17.13

 
to
 
30.01

 
20.22

Granted
—

 
—

 
to
 
—

 
—

Forfeited and expired
(246,394
)
 
17.13

 
to
 
30.01

 
18.90

Exercised
(134,200
)
 
17.13

 
to
 
19.84

 
17.23

Outstanding at December 31, 2016
500,919

 
17.13

 
to
 
30.01

 
21.67

Granted
209,551

 
15.65

 
to
 
15.65

 
15.65

Forfeited and expired
(60,685
)
 
17.13

 
to
 
30.01

 
21.42

Exercised
(41,265
)
 
19.84

 
to
 
19.84

 
19.84

Outstanding at December 31, 2017
608,520

 
$
15.65

 
to
 
$
24.84

 
$
19.75
Summary Of Additional Information On Stock Options Outstanding And Exercisable
The following table summarizes additional information about stock options outstanding and exercisable at December 31, 2017:
 
 
 
 
 
 
Options Outstanding at December 31, 2017
 
Options Exercisable at December 31, 2017
 
 
 
 
 
 
 
 
Weighted Average
 
Aggregate Intrinsic Value
(In thousands)
 
 
 
 
 
Aggregate Intrinsic Value
(In thousands)
Range of
Exercise Prices
 
Shares
 
Remaining Contractual Life (Years)
 
Exercise
Price
 
 
Shares
 
Weighted
Average
Exercise
Price
 
$
—

 
to
 
$
15.00

 
—

 
0.0
 
$
—

 
$
—

 
—

 
$
—

 
$
—

15.01

 
to
 
17.50

 
209,551

 
6.4
 
15.65

 
743,906

 
—

 
—

 
—

17.51

 
to
 
20.00

 
171,460

 
2.2
 
19.58

 
429

 
171,460

 
19.58

 
429

20.01

 
to
 
25.00

 
227,509

 
5.6
 
23.64

 
—

 
214,198

 
23.71

 
—

Total
 
608,520

 
4.9
 
$
19.75

 
$
744,335

 
385,658

 
$
21.88

 
$
429
Summary Of Additional Information On Non-Vested Restricted Stock Outstanding
The following table summarizes additional information about unvested restricted stock outstanding at December 31, 2017, 2016 and 2015:
 
Unvested Restricted Stock
 
Maximum Unvested Restricted Stock Units Issuable Upon Satisfaction of Certain Performance Criteria
 
Number
of Shares
 
Weighted Avg. Grant Date Fair Value/Share
 
Grant Date
Fair Value
(In thousands)
 
Number
of Shares
 
Weighted Avg. Grant Date Fair Value/Share
 
Grant Date
Fair Value
(In thousands)
Outstanding at January 1, 2015
188,058

 
$
22.48

 
$
4,227

 
129,713

 
$
24.99

 
$
3,241

Granted
147,666

 
18.87

 
2,786

 
144,582

 
18.47

 
2,670

Vested
(174,145
)
 
20.57

 
(3,582
)
 
—

 
—

 
—

Forfeited
(29,226
)
 
21.42

 
(626
)
 
(107,167
)
 
20.78

 
(2,227
)
Outstanding at December 31, 2015
132,353

 
21.19

 
2,805

 
167,128

 
22.04

 
3,684

Granted
144,546

 
13.47

 
1,947

 
136,986

 
11.34

 
1,553

Vested
(52,167
)
 
21.56

 
(1,125
)
 
—

 
—

 
—

Forfeited
(17,377
)
 
18.97

 
(330
)
 
(65,685
)
 
20.24

 
(1,329
)
Outstanding at December 31, 2016
207,355

 
15.90

 
3,297

 
238,429

 
16.39

 
3,908

Granted
107,362

 
18.29

 
1,964

 
46,205

 
17.38

 
803

Vested
(50,154
)
 
19.72

 
(989
)
 
—

 
—

 
—

Forfeited
(57,887
)
 
16.16

 
(935
)
 
(112,501
)
 
17.73

 
(1,995
)
Outstanding at December 31, 2017
206,676

 
$
16.15

 
$
3,337

 
172,133

 
$
15.78

 
$
2,716