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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
The following table summarizes stock option activity for the nine months ended September 30, 2016.
 
Number
of Options
 
Weighted-
average
Exercise
Price
 
Weighted-
average
Remaining
Contractual
Term in Years
 
Aggregate
Intrinsic
Value
(dollars in thousands)
 
 
 
 
 
 
 
Outstanding at December 31, 2015
3,731,761

 
$
14.33

 
 
 
 
Granted
20,000

 
25.18

 
 
 
 
Exercised
(44,337
)
 
10.28

 
 
 
$
623

Forfeited
(1,275
)
 
18.72

 
 
 
 
Outstanding at September 30, 2016
3,706,149

 
$
14.44

 
6.07
 
$
39,745

Exercisable at September 30, 2016
1,095,912

 
$
10.03

 
4.03
 
$
16,584
Summary of Restricted Stock Activity
The following table summarizes restricted stock unit activity for the nine months ended September 30, 2016.
 
Restricted
Stock Units
 
Weighted-
average Grant-
date Fair Value
Outstanding and unvested at December 31, 2015
873,264

 
$
14.24

Granted
247,285

 
23.85

Vested
(97,664
)
 
14.82

Forfeited
(973
)
 
19.86

Outstanding and unvested at September 30, 2016
1,021,912

 
$
16.51