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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments [Abstract]  
Trading Securities
The Company’s trading securities consist of the following:

  
Amortized Cost
  
Gross Unrealized Gains
  
Gross Unrealized Losses
  
Fair Value (Net Carrying Amount)
 
December 31, 2018
            
Trading equity securities
 
$
5,546
  
$
50
  
$
365
  
$
5,231
 
Trading debt securities
  
11,817
   
55
   
267
   
11,605
 
Total
 
$
17,363
  
$
105
  
$
632
  
$
16,836
 
December 31, 2017
                
Trading equity securities
 
$
4,964
  
$
394
  
$
31
  
$
5,327
 
Trading debt securities
  
10,971
   
58
   
179
   
10,850
 
Total
 
$
15,935
  
$
452
  
$
210
  
$
16,177