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Stock Based Compensation Plan (Tables)
6 Months Ended
Jun. 30, 2018
Stock Based Compensation Plan [Abstract]  
Stock Award Activity
The following table summarizes our award activity during the six months ended June 30, 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)
  
(124,550
)
  
22.50
   
(48,661
)
  
24.10
   
   
 
Forfeited
  
(1,100
)
  
22.74
   
(7,033
)
  
21.25
   
   
 
Outstanding at June 30, 2018
  
244,875
  
$
22.07
   
228,020
  
$
21.55
   
57,000
  
$
18.14
 
Exercisable at June 30, 2018
  
       
       
57,000
  
$
18.14
 
Awards expected to vest
  
244,875
  
$
22.07
   
206,330
  
$
21.50
         

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