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Stock Based Compensation Plan (Tables)
6 Months Ended
Jun. 30, 2016
Stock Based Compensation Plan [Abstract]  
Stock Award Activity
The following table summarizes our award activity during the six months ended June 30, 2016:
  
Restricted Stock Awards
  
Stock-Settled
Appreciation Rights
 
 
 
Shares or Units
  
Weighted-Average
Award Price
  
Rights
  
Weighted-Average
Award Price
 
Outstanding at December 31, 2015
  
344,490
  
$
22.87
   
100,875
  
$
18.14
 
Granted
  
205,640
   
18.80
   
   
 
Restrictions lapsed or exercised
  
(140,864
)
  
18.29
   
   
 
Forfeited
  
(4,450
)
  
19.29
   
   
 
Outstanding at June 30, 2016
  
404,816
  
$
21.65
   
100,875
  
$
18.14
 
Exercisable at June 30, 2016
  
   
   
74,875
  
$
18.14
 
Awards expected to vest
  
408,886
  
$
21.62
   
100,875
  
$
18.14