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Investments (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014
  
   
   
   
 
Trading equity securities
 $
4,335
  $
374
  $
9
  $
4,700
 
Trading debt securities
  
8,573
   
107
   
71
   
8,609
 
Total
 
$
12,908
  
$
481
  
$
80
  
$
13,309
 
December 31, 2013
  
   
   
   
 
Trading equity securities
 $
19,411
  $
1,459
  $
31
  $
20,839
 
Trading debt securities
  
8,385
   
174
   
137
   
8,422
 
Total
 
$
27,796
  
$
1,633
  
$
168
  
$
29,261