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Fair Value Measurements (Tables)
 9 Months Ended
Oct. 01, 2016
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
 
October 1, 2016:
            
Assets:
            
Assets held in rabbi trusts
 
$
42,178
  
$
27,663
  
$
14,515
  
$
-
 
Available for sale securities
 
$
4,280
   
4,280
   
-
   
-
 
  
$
46,458
  
$
31,943
  
$
14,515
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(426
)
 
$
-
  
$
-
  
$
(426
)
Embedded derivative - convertible debentures due 2041
 
$
(302
)
  
-
   
-
   
(302
)
Embedded derivative - convertible debentures due 2042
 
$
(200
)
  
-
   
-
   
(200
)
  
$
(928
)
 
$
-
  
$
-
  
$
(928
)
December 31, 2015:
                
Assets:
                
Assets held in rabbi trusts
 
$
39,849
  
$
25,906
   
13,943
  
$
-
 
Available for sale securities
 
$
3,604
   
3,604
   
-
   
-
 
  
$
43,453
  
$
29,510
  
$
13,943
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(576
)
 
$
-
  
$
-
  
$
(576
)
Embedded derivative - convertible debentures due 2041
 
$
(438
)
  
-
   
-
   
(438
)
Embedded derivative - convertible debentures due 2042
 
$
(302
)
  
-
   
-
   
(302
)
  
$
(1,316
)
 
$
-
  
$
-
  
$
(1,316
)