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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2016
Fair Value Measurements [Abstract]  
Schedule of financial assets and liabilities, at fair value
As indicated in the tables below (which excludes the Company’s pension assets), the Company has determined that all of its financial assets and liabilities as of March 31, 2016 and December 31, 2015 are Level 1 and Level 2 in the fair value hierarchy as defined above:

   
March 31, 2016
 
   
Level 1
  
Level 2
  
Total
 
Financial Assets:
         
Trading equity securities:
         
SERP money market fund
 
$
453
  
$
-
  
$
453
 
SERP mutual funds
  
2,895
   
--
   
2,895
 
Preferred stocks
  
1,008
   
--
   
1,008
 
Trading debt securities:
            
Corporate bonds
  
2,821
   
621
   
3,442
 
Municipal bonds
  
--
   
3,036
   
3,036
 
Floating rate notes
  
72
   
--
   
72
 
Asset backed securities
  
--
   
779
   
779
 
Savings bonds
  
84
   
--
   
84
 
Other
  
--
   
2,128
   
2,128
 
Derivative financial instruments
  
--
   
488
   
488
 
    Total financial assets
 
$
7,333
  
$
7,052
  
$
14,385
 
             
Financial Liabilities:
            
SERP liabilities
 
$
--
  
$
6,307
  
$
6,307
 
Derivative financial instruments
  
--
   
526
   
526
 
    Total financial liabilities
 
$
--
  
$
6,833
  
$
6,833
 
 
   
December 31, 2015
 
   
Level 1
  
Level 2
  
Total
 
Financial Assets:
         
Trading equity securities:
         
SERP money market fund
 
$
445
  
$
--
  
$
445
 
SERP mutual funds
  
2,864
   
--
   
2,864
 
Preferred stocks
  
742
   
--
   
742
 
Trading debt securities:
            
Corporate bonds
  
3,756
   
141
   
3,897
 
Municipal bonds
  
--
   
1,811
   
1,811
 
Floating rate notes
  
84
   
--
   
84
 
U.S. Treasury bills
  
404
   
--
   
404
 
Savings bonds
  
77
   
--
   
77
 
Other
  
--
   
2,755
   
2,755
 
Derivative financial instruments
  
--
   
1,265
   
1,265
 
    Total financial assets
 
$
8,372
  
$
5,972
  
$
14,344
 
             
Financial Liabilities:
            
SERP liabilities
 
$
-
  
$
5,869
  
$
5,869
 
    Total financial liabilities
 
$
-
  
$
5,869
  
$
5,869