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Stock Based Compensation Plan (Tables)
3 Months Ended
Mar. 31, 2018
Stock Based Compensation Plan [Abstract]  
Stock Award Activity
The following table summarizes our award activity during the three months ended March 31, 2018:

  
Service-Based
Restricted Stock Awards
  
Performance-Based
Restricted Stock Awards
  
Stock-Settled
Appreciation Rights
 
 
 
Shares or Units
  
Weighted-Average
Award Price
  
Shares or Units
  
Weighted-Average
Award Price
  
Rights
  
Weighted-Average
Award Price
 
Outstanding at December 31, 2017
  
254,490
  
$
21.88
   
179,774
  
$
21.42
   
57,000
  
$
18.14
 
Granted/Issued
  
116,035
   
22.95
   
103,940
   
22.95
   
   
 
Awards vested or rights exercised(1)
  
   
   
(46,269
)
  
20.35
   
   
 
Forfeited
  
(400
)
  
22.38
   
(7,033
)
  
   
   
 
Outstanding at March 31, 2018
  
370,125
  
$
22.21
   
230,412
  
$
21.60
   
57,000
  
$
18.14
 
Exercisable at March 31, 2018
  
   
   
   
   
57,000
  
$
18.14
 
Awards expected to vest
  
370,125
  
$
22.21
   
214,481
  
$
21.58
   
   
 

(1)
Includes shares repurchased from employees for employee's tax liability.