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Stock Based Compensation Plan (Tables)
 9 Months Ended
Sep. 30, 2017
Stock Based Compensation Plan [Abstract]  
Stock Award Activity
The following table summarizes our award activity during the nine months ended September 30, 2017:
  
Restricted Stock Awards
  
Stock-Settled
Appreciation Rights
 
 
 
Shares or Units
  
Weighted-Average
Award Price
  
Rights
  
Weighted-Average
Award Price
 
Outstanding at December 31, 2016
  
397,320
  
$
21.64
   
100,875
  
$
18.14
 
Granted
  
199,382
   
22.00
   
—
   
—
 
Restrictions lapsed or exercised
  
(157,406
)
  
22.02
   
(43,875
)
  
18.14
 
Forfeited
  
(4,507
)
  
19.79
   
—
   
—
 
Outstanding at September 30, 2017
  
434,789
  
$
21.69
   
57,000
  
$
18.14
 
Exercisable at September 30, 2017
  
—
   
—
   
57,000
  
$
18.14
 
Awards expected to vest
  
420,491
  
$
21.70
   
—
   
—