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Earnings (Loss) per Share
6 Months Ended
Jun. 30, 2018
Earnings (Loss) per Share [Abstract]  
Earnings (Loss) per Share
Note 2.  Earnings (Loss) per Share
Basic earnings (loss) per share are determined by dividing earnings (loss) by the weighted average number of common shares outstanding during each period.  Diluted earnings (loss) per share include the potential dilutive effect of restricted stock units and shares held in the Company's Supplemental Executive Retirement Plan.

The following table sets forth net income (loss) attributable to controlling interest and the number of basic and diluted shares used in the computation of earnings (loss) per share:

  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2018
  
2017
  
2018
  
2017
 
Numerator:
            
Net income (loss) attributable to controlling interest
 
$
(40,674
)
 
$
14,420
  
$
(20,407
)
 
$
29,540
 
Denominator:
                
Denominator for basic earnings (loss) per share
  
23,061
   
23,026
   
23,053
   
23,020
 
Effect of dilutive securities:
                
Restricted stock units
  
--
   
93
   
--
   
97
 
Supplemental Executive Retirement Plan
  
--
   
64
   
--
   
62
 
Denominator for diluted earnings (loss) per share
  
23,061
   
23,183
   
23,053
   
23,179