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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Measurements [Abstract]  
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 June 30, 2018 and December 31, 2017 are Level 1 and Level 2 in the fair value hierarchy as defined above:

  
June 30, 2018
 
   
Level 1
  
Level 2
  
Total
 
Financial Assets:
         
Trading equity securities:
         
SERP money market fund
 
$
257
  
$
--
  
$
257
 
SERP mutual funds
  
5,247
   
--
   
5,247
 
Preferred stocks
  
283
   
--
   
283
 
Trading debt securities:
            
Corporate bonds
  
5,495
   
--
   
5,495
 
Municipal bonds
  
--
   
1,522
   
1,522
 
Floating rate notes
  
1,556
   
--
   
1,556
 
U.S. Treasury notes
  
1,306
   
--
   
1,306
 
Asset backed securities
  
--
   
478
   
478
 
Other
  
--
   
852
   
852
 
Derivative financial instruments
  
--
   
538
   
538
 
    Total financial assets
 
$
14,144
  
$
3,390
  
$
17,534
 
             
Financial Liabilities:
            
SERP liabilities
 
$
--
  
$
8,913
  
$
8,913
 
    Total financial liabilities
 
$
--
  
$
8,913
  
$
8,913
 
 
   
December 31, 2017
 
   
Level 1
  
Level 2
  
Total
 
Financial Assets:
         
Trading equity securities:
         
SERP money market fund
 
$
124
  
$
--
  
$
124
 
SERP mutual funds
  
4,839
   
--
   
4,839
 
Preferred stocks
  
364
   
--
   
364
 
Trading debt securities:
            
Corporate bonds
  
5,661
   
--
   
5,661
 
Municipal bonds
  
--
   
1,912
   
1,912
 
Floating rate notes
  
753
   
--
   
753
 
U.S. Treasury notes
  
1,030
   
--
   
1,030
 
Asset backed securities
  
--
   
526
   
526
 
Other
  
--
   
968
   
968
 
    Total financial assets
 
$
12,771
  
$
3,406
  
$
16,177
 
             
Financial Liabilities:
            
SERP liabilities
 
$
--
  
$
8,552
  
$
8,552
 
Derivative financial instruments
  
--
   
112
   
112
 
    Total financial liabilities
 
$
--
  
$
8,664
  
$
8,664