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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
The following are the weighted-average assumptions used for grants issued:
 
For the years ended
 
December 31,
2017
 
December 31,
2016
 
December 31,
2015
 
 
 
 
 
 
Volatility
30.68
%
 
32.58
%
 
23.85
%
Risk-free interest rate
1.93
%
 
1.23
%
 
1.88
%
Expected term (years)
5

 
5

 
6.5

Dividend yield
—

 
—

 
—

Grant-date fair value
$
7.00

 
$
7.81

 
$
5.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
The following table summarizes stock option activity during the year and also presents stock options outstanding and exercisable as of December 31, 2017 (dollars in millions, except for per share data):




Number of
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life (In Years)
 
Aggregate Intrinsic Value
 
 
 
 
 
 
 
 
Outstanding, December 31, 2016
4,248,156

 
$
7.21

 

 
 
Granted
383,887

 
$
23.00

 

 
 
Exercised
(1,055,624
)
 
$
5.71

 

 
 
Forfeited
(117,245
)
 
$
15.99

 

 
 
Expired
(42,641
)
 
$
10.73

 

 
 
Outstanding, December 31, 2017
3,416,533

 
$
9.09

 
3.58
 
$
81.1

Exercisable, December 31, 2017
2,727,179

 
$
5.83

 
2.35
 
$
73.6
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes RSA and RSU activity for the year ended December 31, 2017:
 
RSAs
 
RSUs





Number of
Shares
 
Weighted Average Grant Date Fair Value
 
Number of
Shares
 
Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016
—

 
$
—

 
61,861

 
$
25.45

Granted
35,430

 
$
23.00

 
106,609

 
$
23.00

Vested
(35,430
)
 
$
23.00

 
(1,220
)
 
$
24.58

Forfeited
—

 
$
—

 
(9,458
)
 
$
24.44

Outstanding at December 31, 2017
—

 
$
—

 
157,792

 
$
23.86
Schedule of Unrecognized Compensation Cost, Nonvested Awards
(dollars in thousands)
 
2018
$
2,819

2019
1,974

2020
457

Total
$
5,250