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Stock Based Compensation Plan (Tables)
3 Months Ended
Mar. 31, 2015
Stock Based Compensation Plan [Abstract]  
Stock Award Activity
The following table summarizes our award activity during the three months ended March 31, 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
  
171,485
   
24.00
   
   
 
Restrictions lapsed or exercised
  
   
   
(19,100
)
  
8.74
 
Forfeited
  
(2,802
)
  
24.74
   
   
 
Outstanding at March 31, 2015
  
490,005
  
$
21.69
   
110,875
  
$
17.29
 
Exercisable at March 31, 2015
  
   
   
32,875
  
$
15.28