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Equity Compensation Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Stock Options Activity
The following table summarizes the restricted stock unit award activity for the years ended December 31, 2019, 2018 and 2017 (shares in thousands):

 
2019
 
2018
 
2017
 
 
 
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
254

 
$
59.53

 
157

 
$
47.36

 
30

 
$
45.93

Performance-based grants (1)
109

 
86.86

 
102

 
72.70

 
117

 
48.25

Time-based grants
19

 
86.86

 
17

 
72.70

 
20

 
43.55

Performance-based vested
(10
)
 
45.93

 
(10
)
 
45.93

 
(10
)
 
45.93

Time-based vested
(15
)
 
73.78

 
(12
)
 
43.55

 
—

 
—

Outstanding at end of year
357

 
$
69.13

 
254

 
$
59.53

 
157

 
$
47.36



(1) 
Represents the maximum possible award. The Company’s level of achievement of the respective performance goals will result in actual vesting of between zero shares and the maximum share award.
Schedule of Share-based Compensation, Shares Authorized under Stock Option and Warrant Plans, by Exercise Price
Stock options outstanding as of December 31, 2019 are as follows (shares in thousands):

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

 
 
 
40

 
 
1.9
 
 
20

 
 
40.00

 
 
 
30

 
 
1.0
 
 
20

 
 
 
 
 
 
70

 
 
1.5
 
 
40

 
Schedule of Stock Options Activity
The following table summarizes stock option activity for the years ended December 31, 2019, 2018 and 2017 (shares in thousands):

 
2019
 
2018
 
2017
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Weighted-
 
 
 
Average
 
 
 
Average
 
 
 
Average
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Underlying
 
Exercise
 
Shares
 
Price
 
Shares
 
Price
 
Shares
 
Price
Outstanding at beginning of year
80

 
$
39.00

 
90

 
$
39.11

 
103

 
$
37.34

Exercised
(10
)
 
40.00

 
(10
)
 
40.00

 
(13
)
 
24.57

Outstanding at end of year
70

 
38.86

 
80

 
39.00

 
90

 
39.11

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable at end of year
40

 
39.00

 
30

 
39.33

 
20

 
40.00
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,
 
2019
 
2018
 
2017
Gross compensation costs:
 
 
 
 
 
Restricted stock unit awards
$
8,637

 
$
5,712

 
$
2,959

Stock options
43

 
74

 
110

Total gross compensation costs
8,680

 
5,786

 
3,069

 
 
 
 
 
 
Income tax benefits:
 
 
 
 
 
Restricted stock unit awards
(302
)
 
(1,320
)
 
(1,036
)
Exercise of stock options
(114
)
 
(94
)
 
(39
)
Total income tax benefits
(416
)
 
(1,414
)
 
(1,075
)
 
 
 
 
 
 
Net compensation expense
$
8,264

 
$
4,372

 
$
1,994