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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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
June 30,
  
Six Months Ended
June 30,
 
  
2017
  
2016
  
2017
  
2016
 
Basic Net Earnings Per Common Share:
            
Earnings from continuing operations
 
$
18,261
  
$
19,862
  
$
34,628
  
$
32,518
 
Loss from discontinued operations
  
(497
)
  
(618
)
  
(1,130
)
  
(1,070
)
Net earnings available to common stockholders
 
$
17,764
  
$
19,244
  
$
33,498
  
$
31,448
 
                 
Weighted average common shares outstanding
  
22,820
   
22,705
   
22,833
   
22,674
 
                 
Earnings from continuing operations per common share
 
$
0.80
  
$
0.87
  
$
1.52
  
$
1.43
 
Loss from discontinued operations per common share
  
(0.02
)
  
(0.02
)
  
(0.05
)
  
(0.04
)
Basic net earnings per common share
 
$
0.78
  
$
0.85
  
$
1.47
  
$
1.39
 
                 
Diluted Net Earnings Per Common Share:
                
Earnings from continuing operations
 
$
18,261
  
$
19,862
  
$
34,628
  
$
32,518
 
Loss from discontinued operations
  
(497
)
  
(618
)
  
(1,130
)
  
(1,070
)
Net earnings available to common stockholders
 
$
17,764
  
$
19,244
  
$
33,498
  
$
31,448
 
                 
Weighted average common shares outstanding
  
22,820
   
22,705
   
22,833
   
22,674
 
Plus incremental shares from assumed conversions:
                
Dilutive effect of restricted stock and performance-based stock
  
509
   
314
   
499
   
315
 
Weighted average common shares outstanding – Diluted
  
23,329
   
23,019
   
23,332
   
22,989
 
                 
Earnings from continuing operations per common share
 
$
0.78
  
$
0.86
  
$
1.48
  
$
1.41
 
Loss from discontinued operations per common share
  
(0.02
)
  
(0.02
)
  
(0.04
)
  
(0.04
)
Diluted net earnings per common share
 
$
0.76
  
$
0.84
  
$
1.44
  
$
1.37
 
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
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
 
Restricted and performance-based shares
  
228
   
338
   
240
   
341