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Investments (Tables)
12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Schedule of 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, 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
 
December 31, 2016
                
Trading equity securities
 
$
3,980
  
$
40
  
$
118
  
$
3,902
 
Trading debt securities
  
11,312
   
23
   
248
   
11,087
 
Total
 
$
15,292
  
$
63
  
$
366
  
$
14,989