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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Reconciliations of the Earnings Available to Common Stockholders and the Shares used in Calculating Basic and Dilutive Net Earnings per Common Share
The following are reconciliations of the earnings available to common stockholders and the shares used in calculating basic and dilutive net earnings per common share (in thousands, except per share data):

  
Year Ended December 31,
 
  
2018
  
2017
  
2016
 
Basic Net Earnings Per Common Share:
         
Earnings from continuing operations
 
$
56,854
  
$
43,630
  
$
62,412
 
Loss from discontinued operations
  
(13,851
)
  
(5,654
)
  
(1,982
)
Net earnings available to common stockholders
 
$
43,003
  
$
37,976
  
$
60,430
 
             
Weighted average common shares outstanding
  
22,456
   
22,726
   
22,723
 
             
Earnings from continuing operations per common share
 
$
2.53
  
$
1.92
  
$
2.75
 
Loss from discontinued operations per common share
  
(0.62
)
  
(0.25
)
  
(0.09
)
Basic net earnings per common share
 
$
1.91
  
$
1.67
  
$
2.66
 
             
Diluted Net Earnings Per Common Share:
            
Earnings from continuing operations
 
$
56,854
  
$
43,630
  
$
62,412
 
Loss from discontinued operations
  
(13,851
)
  
(5,654
)
  
(1,982
)
Net earnings available to common stockholders
 
$
43,003
  
$
37,976
  
$
60,430
 
             
Weighted average common shares outstanding
  
22,456
   
22,726
   
22,723
 
Plus incremental shares from assumed conversions:
            
Dilutive effect of restricted stock and performance-based stock
  
476
   
472
   
360
 
Weighted average common shares outstanding – Diluted
  
22,932
   
23,198
   
23,083
 
             
Earnings from continuing operations per common share
 
$
2.48
  
$
1.88
  
$
2.70
 
Loss from discontinued operations per common share
  
(0.60
)
  
(0.24
)
  
(0.08
)
Diluted net earnings per common share
 
$
1.88
  
$
1.64
  
$
2.62
 
Anti-dilutive Securities Excluded from Computation of Earnings per Share
The shares listed below were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented or because they were excluded under the treasury method (in thousands):

  
2018
  
2017
  
2016
 
Restricted and performance shares
  
249
   
248
   
304