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Fair Value Measurements (Tables)
 6 Months Ended
Jul. 01, 2017
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
 
July 1, 2017
            
Assets:
            
Assets held in rabbi trusts
 
$
43,502
  
$
27,940
  
$
15,562
  
$
-
 
Available for sale securities
 
$
4,335
   
4,335
   
-
   
-
 
  
$
47,837
  
$
32,275
  
$
15,562
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(349
)
 
$
-
  
$
-
  
$
(349
)
Embedded derivative - convertible debentures due 2041
 
$
(293
)
  
-
   
-
   
(293
)
Embedded derivative - convertible debentures due 2042
 
$
(184
)
  
-
   
-
   
(184
)
  
$
(826
)
 
$
-
  
$
-
  
$
(826
)
December 31, 2016
                
Assets:
                
Assets held in rabbi trusts
 
$
41,917
  
$
27,297
   
14,620
  
$
-
 
Available for sale securities
 
$
3,969
   
3,969
   
-
   
-
 
  
$
45,886
  
$
31,266
  
$
14,620
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(393
)
 
$
-
  
$
-
  
$
(393
)
Embedded derivative - convertible debentures due 2041
 
$
(285
)
  
-
   
-
   
(285
)
Embedded derivative - convertible debentures due 2042
 
$
(176
)
  
-
   
-
   
(176
)
  
$
(854
)
 
$
-
  
$
-
  
$
(854
)