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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 30, 2013
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 30, 2013:
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
Assets held in rabbi trusts
 
$
34,617
 
 
$
22,406
 
 
$
12,211
 
 
$
-
 
Available for sale securities
 
$
7,237
 
 
 
7,237
 
 
 
-
 
 
 
-
 
 
 
$
41,854
 
 
$
29,643
 
 
$
12,211
 
 
$
-
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded derivative - convertible debentures due 2040
 
$
(475
)
 
$
-
 
 
$
-
 
 
$
(475
)
Embedded derivative - convertible debentures due 2041
 
$
(311
)
 
 
-
 
 
 
-
 
 
 
(311
)
Embedded derivative - convertible debentures due 2042
 
$
(209
)
 
 
-
 
 
 
-
 
 
 
(209
)
 
 
$
(995
)
 
$
-
 
 
$
-
 
 
$
(995
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets held in rabbi trusts
 
$
33,751
 
 
$
21,954
 
 
$
11,797
 
 
$
-
 
Available for sale securities
 
$
7,580
 
 
 
7,580
 
 
 
-
 
 
 
-
 
 
 
$
41,331
 
 
$
29,534
 
 
$
11,797
 
 
$
-
 
Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Embedded derivative - convertible debentures due 2040
 
$
(622
)
 
$
-
 
 
$
-
 
 
$
(622
)
Embedded derivative - convertible debentures due 2041
 
$
(399
)
 
 
-
 
 
 
-
 
 
 
(399
)
Embedded derivative - convertible debentures due 2042
 
$
(282
)
 
 
-
 
 
 
-
 
 
 
(282
)
 
 
$
(1,303
)
 
$
-
 
 
$
-
 
 
$
(1,303
)