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Fair Value Measurements (Tables)
 3 Months Ended
Apr. 04, 2015
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 4, 2015:
        
Assets:
        
Assets held in rabbi trusts
 
$
40,411
  
$
26,737
  
$
13,674
  
$
-
 
Available for sale securities
 
$
5,680
   
4,003
   
1,677
   
-
 
  
$
46,091
  
$
30,740
  
$
15,351
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(467
)
 
$
-
  
$
-
  
$
(467
)
Embedded derivative - convertible debentures due 2041
 
$
(354
)
  
-
   
-
   
(354
)
Embedded derivative - convertible debentures due 2042
 
$
(231
)
  
-
   
-
   
(231
)
  
$
(1,052
)
 
$
-
  
$
-
  
$
(1,052
)
                 
December 31, 2014:
                
Assets:
                
Assets held in rabbi trusts
 
$
40,270
  
$
26,853
  $ 
13,417
  
$
-
 
Available for sale securities
 
$
15,432
   
4,439
   
10,993
   
-
 
  
$
55,702
  
$
31,292
  
$
24,410
  
$
-
 
Liabilities:
                
Embedded derivative - convertible debentures due 2040
 
$
(526
)
 
$
-
  
$
-
  
$
(526
)
Embedded derivative - convertible debentures due 2041
 
$
(341
)
  
-
   
-
   
(341
)
Embedded derivative - convertible debentures due 2042
 
$
(238
)
  
-
   
-
   
(238
)
  
$
(1,105
)
 
$
-
  
$
-
  
$
(1,105
)