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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 28, 2019
Fair Value Measurements [Abstract]  
Fair Value of Assets and Liabilities Carried at Fair Value Measured on Recurring Basis
The following table provides the financial assets and liabilities carried at fair value measured on a recurring basis:


  
Total
Fair Value
    
Level 1
    
Level 2
    
Level 3
  
September 28, 2019
                        
Assets:
                        
Assets held in rabbi trusts
  
$
51,065
    
$
34,217
    
$
16,848
    
$
-
  
Available for sale securities
  
$
4,328
      
4,328
      
-
      
-
  
   
$
55,393
    
$
38,545
    
$
16,848
    
$
-
  
Liabilities:
                                
Embedded derivative - convertible debentures due 2040
  
$
-
    
$
-
    
$
-
    
$
-
  
Embedded derivative - convertible debentures due 2041
  
$
(10
)
    
-
      
-
      
(10
)
   
$
(10
)
  
$
-
    
$
-
    
$
(10
)
December 31, 2018
                                
Assets:
                                
Assets held in rabbi trusts
  
$
41,770
    
$
26,278
      
15,492
    
$
-
  
Available for sale securities
  
$
4,309
      
4,309
      
-
      
-
  
   
$
46,079
    
$
30,587
    
$
15,492
    
$
-
  
Liabilities:
                                
Embedded derivative - convertible debentures due 2040
  
$
(1
)
  
$
-
    
$
-
    
$
(1
)
Embedded derivative - convertible debentures due 2041
  
$
(67
)
    
-
      
-
      
(67
)
Embedded derivative - convertible debentures due 2042
  
$
(2
)
    
-
      
-
      
(2
)
   
$
(70
)
  
$
-
    
$
-
    
$
(70
)