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Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Unit Activity
The following table summarizes the activity of our restricted stock units ("RSUs"):
 
 
Six months ended June 30,
 
 
2015
 
2014
 
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
Beginning balance
 
102,786

 
$
15.43

 
140,222

 
$
11.00

   Granted
 
65,436

 
$
15.10

 
63,372

 
$
17.24

   Vested
 
(59,438
)
 
$
17.20

 

 
$

   Forfeited
 
(1,952
)
 
$
14.51

 
(1,478
)
 
$
11.00

Ending balance
 
106,832

 
$
14.26

 
202,116

 
$
12.96

Schedule of Other Share-based Compensation, Activity [Table Text Block]
The following table summarizes the activity of our PSUs:
Period Granted
 
Target PSUs Outstanding December 31, 2014
 
Target PSUs Granted
 
Target PSUs Vested
 
Target PSUs Forfeited
 
Target PSUs Outstanding at June 30, 2015
 
Weighted Average Grant Date Fair Value
2014
 
62,906

 

 

 

 
62,906

 
$
17.09

2015
 

 
127,111

 

 

 
127,111

 
$
13.34

Total
 
62,906

 
127,111

 

 

 
190,017