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Equity Compensation Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Shares Authorized under Stock Option and Warrant Plans, by Exercise Price
Stock options outstanding as of December 31, 2017 are as follows (shares in thousands):

 
 
 
 
 
 
Weighted-Average
 
Currently
Exercise Price
 
Option Shares
 
Remaining Life
 
Exercisable Shares
 
$
38.00

 
 
 
40

 
 
3.9
 
 
—

 
 
$
40.00

 
 
 
50

 
 
3.0
 
 
20

 
 
 
 
 
 
90

 
 
3.4
 
 
20

 
Schedule of Stock Options Activity
A summary of stock option activity for the years ended December 31, 2017, 2016 and 2015, is as follows (shares in thousands):

 
2017
 
2016
 
2015
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Average
 
 
 
Average
 
 
 
Average
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Shares
 
Price
 
Shares
 
Price
 
Shares
 
Price
Outstanding at beginning of year
103

 
$
37.34

 
103

 
$
37.34

 
758

 
$
20.67

Exercised
(13
)
 
24.57

 
—

 
—

 
(655
)
 
18.06

Outstanding at end of year
90

 
$
39.11

 
103

 
$
37.34

 
103

 
$
37.34

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at end of year
20

 
$
40.00

 
23

 
$
31.43

 
13

 
$
24.57
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The Company’s net income includes the following compensation costs related to share-based compensation arrangements (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Gross compensation costs:
 
 
 
 
 
Nonvested “restricted” stock
2,959

 
4,038

 
280

Stock options
110

 
136

 
149

Total gross compensation costs
3,069

 
4,174

 
429

 
 
 
 
 
 
Income tax benefits:
 
 
 
 
 
Nonvested “restricted” stock (1)
(1,036
)
 
(782
)
 
(98
)
Stock options
(39
)
 
(48
)
 
(52
)
Total income tax benefits
(1,075
)
 
(830
)
 
(150
)
 
 
 
 
 
 
Net compensation expense
$
1,994

 
$
3,344

 
$
279

 
 
 
 
 
 
Tax benefit realized from stock options exercised during the year
$
—

 
$
—

 
$
5,126
Schedule of Nonvested Stock Options Activity
The following table summarizes the restricted stock unit award activity during 2017, 2016 and 2015 (shares in thousands):

 
2017
 
2016
 
2015
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Average
 
 
 
Average
 
 
 
Average
 
Underlying
 
Fair Value
 
Underlying
 
Fair Value
 
Underlying
 
Fair Value
 
Shares
 
of Grant
 
Shares
 
of Grant
 
Shares
 
of Grant
Outstanding at beginning of year
30

 
$
45.93

 
79

 
$
48.10

 
87

 
$
48.99

Granted
137

 
47.57

 
51

 
42.60

 
45

 
47.08

Vested
(10
)
 
45.93

 
(100
)
 
45.96

 
(5
)
 
43.26

Canceled or forfeited
—

 
—

 
—

 
—

 
(48
)
 
49.26

Outstanding at end of year
157

 
47.36

 
30

 
45.93

 
79

 
48.10