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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 29, 2014
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 29, 2014:
 
  
  
  
 
Assets:
 
  
  
  
 
Assets held in rabbi trusts
 
$
37,280
  
$
24,254
  
$
13,026
  
$
-
 
Available for sale securities
 
$
7,453
   
7,453
   
-
   
-
 
 
 
$
44,733
  
$
31,707
  
$
13,026
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(536
)
 
$
-
  
$
-
  
$
(536
)
Embedded derivative - convertible debentures due 2041
 
$
(363
)
  
-
   
-
   
(363
)
Embedded derivative - convertible debentures due 2042
 
$
(217
)
  
-
   
-
   
(217
)
 
 
$
(1,116
)
 
$
-
  
$
-
  
$
(1,116
)
 
                
December 31, 2013:
                
Assets:
                
Assets held in rabbi trusts
 
$
36,992
  
$
24,064
   
12,928
  
$
-
 
Available for sale securities
 
$
7,356
   
7,356
   
-
   
-
 
 
 
$
44,348
  
$
31,420
  
$
12,928
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(491
)
 
$
-
  
$
-
  
$
(491
)
Embedded derivative - convertible debentures due 2041
 
$
(349
)
  
-
   
-
   
(349
)
Embedded derivative - convertible debentures due 2042
 
$
(197
)
  
-
   
-
   
(197
)
 
 
$
(1,037
)
 
$
-
  
$
-
  
$
(1,037
)