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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 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 six months ended June 30, 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
30,660

 
16.12

 
 
 
 
Expired
(24,585
)
 
19.12

 
 
 
 
Outstanding - June 30, 2016
463,926

 
$
19.09

 
2.66
 
$

Options exercisable - June 30, 2016
335,266

 
$
20.32

 
2.66
 
$

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 six months ended June 30, 2016:
 
 
Number of
Shares
 
Weighted-
Average Grant Date
Fair Value
Outstanding - January 1, 2016
107,049

 
$
13.72

Vested
(46,286
)
 
11.98

Forfeited
(2,163
)
 
10.42

Outstanding - June 30, 2016
58,600

 
$
15.21