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Fair Value Measurements (Tables)
 3 Months Ended
Apr. 02, 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
 
April 2, 2016:
            
Assets:
            
Assets held in rabbi trusts
 
$
40,368
  
$
26,433
  
$
13,935
  
$
-
 
Available for sale securities
 
$
4,171
   
4,171
   
-
   
-
 
  
$
44,539
  
$
30,604
  
$
13,935
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(582
)
 
$
-
  
$
-
  
$
(582
)
Embedded derivative - convertible debentures due 2041
 
$
(476
)
  
-
   
-
   
(476
)
Embedded derivative - convertible debentures due 2042
 
$
(285
)
  
-
   
-
   
(285
)
  
$
(1,343
)
 
$
-
  
$
-
  
$
(1,343
)
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
)