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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Compensation Expense Recognized Related to all Stock-Based Awards
The following table presents compensation expense recognized related to all stock-based awards (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Total stock-based compensation
$
14,814

 
$
15,906

 
$
12,612
Summary of Stock Option Awards
The following table presents a summary of stock option awards for the year ended December 31, 2018:
 
 
Options
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
(in thousands)
Options outstanding at December 31, 2017
1,154,658

 
$
14.16

 
4.9

 
$
4,350

Granted
—

 
—

 
—

 


Exercised
(171,747
)
 
$
12.05

 
 
 
 
Forfeited
(29,006
)
 
$
12.73

 
 
 
 
Options outstanding at December 31, 2018
953,905

 
$
14.58

 
4.2

 
$
296

Options exercisable at December 31, 2018
953,905

 
$
14.58

 
4.2

 
$
296
Summary of Restricted Stock Units
The following table presents a summary of restricted stock units (“RSUs”) for the year ended December 31, 2018:
 
Restricted
Stock
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
 
Aggregate
Intrinsic
Value
(in thousands)
Nonvested RSUs at December 31, 2017
4,307,592

 
$
9.80

 
$
77,192

Granted
1,131,231

 
$
15.77

 


Vested
(1,102,727
)
 
$
12.47

 
 
Forfeited
(994,248
)
 
$
9.40

 
 
Nonvested RSUs at December 31, 2018
3,341,848

 
$
11.05

 
$
36,526