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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2018
EARNINGS PER SHARE [Abstract]  
Earnings and Weighted Average Shares Outstanding used in Computation of Basic and Diluted Earnings Per Share
The following table sets forth the calculation of basic and diluted net earnings per common share under the two-class method for the three and nine months ended September 30, 2018 and 2017:
  
 
Three Months Ended
  
Nine Months Ended
 
  
 
September 30,
  
September 30,
 
 
 
2018
  
2017
  
2018
  
2017
 
 
            
Numerator:
            
Net earnings
 
$
11,352
  
$
5,024
  
$
16,684
  
$
8,890
 
Less dividends declared:
                
     Class A
  
130
   
131
   
391
   
392
 
     Class B
  
689
   
691
   
2,079
   
2,079
 
Undistributed earnings
 
$
10,533
  
$
4,202
  
$
14,214
  
$
6,419
 
 
                
Undistributed earnings allocation - basic and diluted:
                
     Class A undistributed earnings
 
$
1,812
  
$
729
  
$
2,461
  
$
1,115
 
     Class B undistributed earnings
  
8,721
   
3,473
   
11,753
   
5,304
 
     Total undistributed earnings
 
$
10,533
  
$
4,202
  
$
14,214
  
$
6,419
 
 
                
Net earnings allocation - basic and diluted:
                
     Class A net earnings
 
$
1,942
  
$
860
  
$
2,852
  
$
1,507
 
     Class B net earnings
  
9,410
   
4,164
   
13,832
   
7,383
 
     Net earnings
 
$
11,352
  
$
5,024
  
$
16,684
  
$
8,890
 
 
                
Denominator:
                
Weighted-average shares outstanding:
                
     Class A - basic and diluted
  
2,175
   
2,175
   
2,175
   
2,175
 
     Class B - basic and diluted
  
9,972
   
9,864
   
9,891
   
9,856
 
 
                
Net earnings per share:
                
     Class A - basic and diluted
 
$
0.89
  
$
0.40
  
$
1.31
  
$
0.69
 
     Class B - basic and diluted
 
$
0.94
  
$
0.42
  
$
1.40
  
$
0.75