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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity Under the Plan
The following is a summary of stock option activity under the 2007 Plan and 2006 Plan for the three months ended March 31, 2016:
 
 
Number of
Shares
 
Weighted-
Average
Exercise
Price Per
Share
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Outstanding - January 1, 2016
457,851

 
$
19.29

 
 
 
 
Granted

 

 
 
 
 
Exercised

 

 
 
 
 
Expired
(23,415
)
 
18.99

 
 
 
 
Forfeited

 

 
 
 
 
Outstanding - March 31, 2016
434,436

 
$
19.30

 
2.19
 
$
480

Options exercisable - March 31, 2016
296,436

 
$
20.92

 
2.19
 
$
480

Summary of Restricted and Performance Unit Activity Under the Plan
The following is a summary of restricted stock and performance unit activity under the 2007 Plan and 2006 Plan for the three months ended March 31, 2016:
 
 
Number of
Shares
 
Weighted-
Average Grant Date
Fair Value
Outstanding - January 1, 2016
107,049

 
$
13.72

Granted

 

Vested
(34,086
)
 
11.12

Forfeited
(2,163
)
 
10.42

Outstanding - March 31, 2016
70,800

 
$
15.07