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Stock Based Compensation Plan (Tables)
6 Months Ended
Jun. 30, 2015
Stock Based Compensation Plan [Abstract]  
Stock Award Activity
The following table summarizes our award activity during the six months ended June 30, 2015:
  
Restricted Stock Awards
  
Stock-Settled
Appreciation Rights
 
 
 
Shares or Units
  
Weighted-Average
Award Price
  
Rights
  
Weighted-Average
Award Price
 
Outstanding at December 31, 2014
  
321,322
  
$
20.49
   
129,975
  
$
16.04
 
Granted
  
171,735
   
24.00
   
   
 
Restrictions lapsed or exercised
  
(147,595
)
  
18.94
   
(19,100
)
  
8.74
 
Forfeited
  
(4,202
)
  
25.08
   
   
 
Outstanding at June 30, 2015
  
341,260
  
$
22.87
   
110,875
  
$
17.29
 
Exercisable at June 30, 2015
  
   
   
58,875
  
$
16.54