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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share

The following is a reconciliation of the income (loss) and number of shares used in calculating the diluted earnings per share for Common Stock and Class A Common Stock (amounts in thousands except per share data):

Numerator:
  
2020
    
2019
    
2018
  
Common:
                  
Distributed earnings
  
$
46,564
    
$
13,913
    
$
32,595
  
Undistributed earnings
    
7,954
      
6,284
      
(4,741
)
Basic
    
54,518
      
20,197
      
27,854
  
Class A Common earnings
    
4,630
      
1,668
      
2,453
  
Diluted
  
$
59,148
    
$
21,865
    
$
30,307
  
Class A Common:
                        
Distributed earnings
  
$
3,957
    
$
1,143
    
$
2,869
  
Undistributed earnings
    
673
      
525
      
(416
)
   
$
4,630
    
$
1,668
    
$
2,453
  

Denominator:
  
2020
    
2019
    
2018
  
Common:
                  
Weighted average shares outstanding - basic
    
17,128
      
18,360
      
19,182
  
Assumed conversion of Class A Common Stock
    
1,522
      
1,611
      
1,765
  
Dilutive options, awards and common stock equivalents
    
282
      
290
      
348
  
Total weighted average diluted Common Stock
    
18,932
      
20,261
      
21,295
  
Class A Common:
                        
Weighted average shares outstanding
    
1,522
      
1,611
      
1,765
  
                         
Basic net earnings per share
                        
Common Stock
  
$
3.18
    
$
1.10
    
$
1.45
  
Class A Common Stock
  
$
3.04
    
$
1.04
    
$
1.39
  
Diluted net earnings per share
                        
Common Stock
  
$
3.12
    
$
1.08
    
$
1.42
  
Class A Common Stock
  
$
3.04
    
$
1.03
    
$
1.39