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Share-Based Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Allocation of Stock-based Compensation Expense and Related Tax Benefit
The following table provides a summary of stock compensation expense, and the related income tax benefit, recognized in the accompanying Consolidated Statements of Income:
 
Years ended December 31,
(In thousands)
2015
 
2014
 
2013
Stock options
$
379

 
$
1,175

 
$
3,902

Restricted stock
10,556

 
9,048

 
6,762

Total stock compensation expense
$
10,935

 
$
10,223

 
$
10,664

 
 
 
 
 
 
Income tax benefit
$
3,903

 
$
3,553

 
$
5,344
Schedule of Unrecognized Stock-based Compensation Expense
The following table provides a summary of unrecognized stock compensation expense:
 
At December 31, 2015
(Dollars in thousands)
Unrecognized Compensation Expense
Weighted-Average Period To Be Recognized
Stock options
$
43

0.1 years
Restricted stock
$
10,937

1.9 years
Summary of Restricted Stock and Stock Option Activity
The following table provides a summary of the activity under the Plans for the year ended December 31, 2015:
 
Unvested Restricted Stock Awards
 
Stock Options Outstanding
 
Time-Based
 
Performance-Based
 
 
Number of
Shares
Weighted-Average
Grant Date
Fair Value
 
Number of
Units
Weighted-Average
Grant Date
Fair Value
 
Number of
Shares
Weighted-Average
Grant Date
Fair Value
 
Number  of
Shares
Weighted-Average
Exercise Price
Balance at January 1, 2015
243,015

$
27.03

 
2,279

$
29.34

 
130,193

$
28.61

 
1,900,144

$
24.95

Granted
223,190

34.82

 
12,531

34.45

 
138,591

36.15

 
—

—

Exercised options
—

—

 
—

—

 
—

—

 
(221,320
)
18.09

Vested restricted stock awards (1)
(220,866
)
28.83

 
(12,722
)
33.53

 
(153,063
)
31.27

 
—

—

Forfeited
(9,194
)
30.27

 
—

—

 
—

—

 
(151,750
)
45.36

Balance at December 31, 2015
236,145

$
32.58

 
2,088

$
34.45

 
115,721

$
34.14

 
1,527,074

$
23.92

 
 
 
 
 
 
 
 
 
 
 
 
Options exercisable, at December 31, 2015
 
 
 
 
 
 
 
 
 
1,420,758

$
23.99

Options expected to vest, at December 31, 2015
 
 
 
 
 
 
 
 
 
105,378

$
23.00

(1) Vested for purposes of recording compensation expense.
Summary of Options Outstanding and Options Exercisable
The following table summarizes information about options outstanding and options exercisable at December 31, 2015:
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
Number of Shares
Weighted-Average Remaining Contractual Life (years)
Weighted-Average Exercise Price
 
Number of Shares
Weighted-Average Remaining Contractual Life (years)
Weighted-Average Exercise Price
$ 5.14 - 20.00
448,941

3.2
$
9.67

 
448,941

3.2
$
9.67

$ 20.01 - 30.00
672,339

6.1
23.54

 
566,023

5.9
23.65

$ 30.01 - 40.00
192,518

2.0
32.03

 
192,518

2.0
32.03

$ 40.01 - 48.88
213,276

1.0
47.77

 
213,276

1.0
47.77

 
1,527,074

4.0
$
23.92

 
1,420,758

3.8
$
23.99