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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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):

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
  
2017
  
2016
  
2017
  
2016
 
Basic Net Earnings Per Common Share:
            
Earnings from continuing operations
 
$
17,108
  
$
21,055
  
$
51,736
  
$
53,573
 
Loss from discontinued operations
  
(3,983
)
  
(425
)
  
(5,113
)
  
(1,495
)
Net earnings available to common stockholders
 
$
13,125
  
$
20,630
  
$
46,623
  
$
52,078
 
                 
Weighted average common shares outstanding
  
22,660
   
22,716
   
22,775
   
22,688
 
                 
Earnings from continuing operations per common share
 
$
0.75
  
$
0.93
  
$
2.27
  
$
2.36
 
Loss from discontinued operations per common share
  
(0.17
)
  
(0.02
)
  
(0.22
)
  
(0.06
)
Basic net earnings per common share
 
$
0.58
  
$
0.91
  
$
2.05
  
$
2.30
 
                 
Diluted Net Earnings Per Common Share:
                
Earnings from continuing operations
 
$
17,108
  
$
21,055
  
$
51,736
  
$
53,573
 
Loss from discontinued operations
  
(3,983
)
  
(425
)
  
(5,113
)
  
(1,495
)
Net earnings available to common stockholders
 
$
13,125
  
$
20,630
  
$
46,623
  
$
52,078
 
                 
Weighted average common shares outstanding
  
22,660
   
22,716
   
22,775
   
22,688
 
Plus incremental shares from assumed conversions:
                
Dilutive effect of restricted stock and performance-based stock
  
515
   
382
   
512
   
357
 
Weighted average common shares outstanding – Diluted
  
23,175
   
23,098
   
23,287
   
23,045
 
                 
Earnings from continuing operations per common share
 
$
0.74
  
$
0.91
  
$
2.22
  
$
2.32
 
Loss from discontinued operations per common share
  
(0.17
)
  
(0.02
)
  
(0.22
)
  
(0.06
)
Diluted net earnings per common share
 
$
0.57
  
$
0.89
  
$
2.00
  
$
2.26
 
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):

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
  
2017
  
2016
  
2017
  
2016
 
Restricted and performance-based shares
  
218
   
297
   
232
   
326