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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 30, 2019
Fair Value Measurements [Abstract]  
Schedule of fair Value, Assets and Liabilities 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
 
March 30, 2019
            
Assets:
            
Assets held in rabbi trusts
 
$
47,849
  
$
31,479
  
$
16,370
  
$
-
 
Available for sale securities
 
$
4,295
   
4,295
   
-
   
-
 
  
$
52,144
  
$
35,774
  
$
16,370
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
0
  
$
-
  
$
-
  
$
0
 
Embedded derivative - convertible debentures due 2041
 
$
(24
)
  
-
   
-
   
(24
)
  
$
(24
)
 
$
-
  
$
-
  
$
(24
)
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
)