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Equity Compensation Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Stock Options Activity
The following table summarizes the restricted stock unit award activity for the years ended December 31, 2018, 2017 and 2016 (shares in thousands):

 
2018
 
2017
 
2016
 
 
 
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
157

 
$
47.36

 
30

 
$
45.93

 
79

 
$
48.10

Granted (1)
119

 
72.70

 
137

 
47.57

 
51

 
42.60

Vested
(22
)
 
44.62

 
(10
)
 
45.93

 
(100
)
 
45.96

Outstanding at end of year
254

 
59.53

 
157

 
47.36

 
30

 
45.93



(1) 
For fiscal 2018 and 2017, includes 102,000 and 117,000 shares, respectively, of performance-based grants, which represents the maximum possible award. The Company’s level of achievement of the respective performance goals will result in actual vesting of between zero and the maximum share award at the end of each respective three-year performance period.
Schedule of Share-based Compensation, Shares Authorized under Stock Option and Warrant Plans, by Exercise Price
Stock options outstanding as of December 31, 2018 are as follows (shares in thousands):

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

 
 
 
40

 
 
2.9
 
 
10

 
 
40.00

 
 
 
40

 
 
2.0
 
 
20

 
 
 
 
 
 
80

 
 
2.5
 
 
30

 
Schedule of Stock Options Activity
The following table summarizes stock option activity for the years ended December 31, 2018, 2017 and 2016, is as follows (shares in thousands):

 
2018
 
2017
 
2016
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Average
 
 
 
Average
 
 
 
Average
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Shares
 
Price
 
Shares
 
Price
 
Shares
 
Price
Outstanding at beginning of year
90

 
$
39.11

 
103

 
$
37.34

 
103

 
$
37.34

Exercised
(10
)
 
40.00

 
(13
)
 
24.57

 
—

 
—

Outstanding at end of year
80

 
39.00

 
90

 
39.11

 
103

 
37.34

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at end of year
30

 
39.33

 
20

 
40.00

 
23

 
31.43
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,
 
2018
 
2017
 
2016
Gross compensation costs:
 
 
 
 
 
Restricted stock unit awards
$
5,712

 
$
2,959

 
$
4,038

Stock options
74

 
110

 
136

Total gross compensation costs
5,786

 
3,069

 
4,174

 
 
 
 
 
 
Income tax benefits:
 
 
 
 
 
Restricted stock unit awards
(1,320
)
 
(1,036
)
 
(782
)
Exercise of stock options
(94
)
 
(39
)
 
(48
)
Total income tax benefits
(1,414
)
 
(1,075
)
 
(830
)
 
 
 
 
 
 
Net compensation expense
$
4,372

 
$
1,994

 
$
3,344