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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
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):
 
 
Three Months Ended March 31,
 
2019
 
2018
Total stock-based compensation
$
3,435

 
$
3,470
Summary of Stock Option Awards
The following table presents a summary of stock option awards for the three months ended March 31, 2019:
 
Options
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
(in thousands)
Options outstanding at December 31, 2018
953,905

 
$
14.58

 
4.2

 
$
296

Granted
—

 
—

 
—

 
—

Exercised
(32,486
)
 
$
6.50

 
—

 
—

Forfeited
—

 
$
—

 
—

 
—

Options outstanding at March 31, 2019
921,419

 
$
14.87

 
4.1

 
$
350

Options exercisable at March 31, 2019
921,419

 
$
14.87

 
4.1

 
$
350
Summary of Restricted Stock Units
The following table presents a summary of RSUs for the three months ended March 31, 2019:
 
Restricted
Stock
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
 
Aggregate
Intrinsic
Value
(in thousands)
Nonvested RSUs at December 31, 2018
3,341,848

 
$
11.05

 
$
36,526

Granted
1,593,747

 
$
12.10

 
—

Vested
(795,528
)
 
$
12.70

 
—

Forfeited
(745,756
)
 
$
5.20

 
—

Nonvested RSUs at March 31, 2019
3,394,311

 
$
12.45

 
$
42,904