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EARNINGS PER SHARE (Tables)
 9 Months Ended
Sep. 30, 2015
EARNINGS PER SHARE [Abstract]  
Earnings and weighted-average shares outstanding used in the 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, 2015 and 2014:

   
Three Months Ended
  
Nine Months Ended
 
   
September 30,
  
September 30,
 
  
2015
  
2014
  
2015
  
2014
 
         
Numerator:
        
Net earnings
 
$
4,920
  
$
1,261
  
$
16,302
  
$
6,829
 
Less dividends declared:
                
     Class A
  
130
   
131
   
391
   
391
 
     Class B
  
681
   
679
   
2,041
   
1,986
 
Undistributed earnings
 
$
4,109
  
$
451
  
$
13,870
  
$
4,452
 
                 
Undistributed earnings allocation - basic and diluted:
                
     Class A undistributed earnings
 
$
722
  
$
80
  
$
2,442
  
$
802
 
     Class B undistributed earnings
  
3,387
   
371
   
11,428
   
3,650
 
     Total undistributed earnings
 
$
4,109
  
$
451
  
$
13,870
  
$
4,452
 
                 
Net earnings allocation - basic and diluted:
                
     Class A net earnings
 
$
852
  
$
211
  
$
2,833
  
$
1,193
 
     Class B net earnings
  
4,068
   
1,050
   
13,469
   
5,636
 
     Net earnings
 
$
4,920
  
$
1,261
  
$
16,302
  
$
6,829
 
                 
Denominator:
                
Weighted-average shares outstanding:
                
     Class A - basic and diluted
  
2,175
   
2,175
   
2,175
   
2,175
 
     Class B - basic and diluted
  
9,719
   
9,591
   
9,694
   
9,420
 
                 
Net earnings per share:
                
     Class A - basic and diluted
 
$
0.39
  
$
0.10
  
$
1.30
  
$
0.55
 
     Class B - basic and diluted
 
$
0.42
  
$
0.11
  
$
1.39
  
$
0.60