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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 26, 2011
Fair Value of Financial Instruments (Thousands of Dollars) [Abstract]  
Fair Value Hierarchy
   
Fair Value Measurements Using:
 
 
 
 
 
 
 
Fair
Value
Quoted
Prices in
Active
Markets
for
Identical
Assets
(Level 1)
 
 
 
Significant
Other
Observable
Inputs
(Level 2)
 
 
 
 
Significant
Unobservable
Inputs
(Level 3)
 
--------
--------
--------
--------
June 26, 2011
       
---------------------
       
Available-for-sale securities
$  20,144 
25
20,119 
-
Derivatives
(2,074)
-
(8,543)
6,469
 
-------- 
-------
--------- 
-------
Total
$  18,070 
25
11,576 
6,469
 
===== 
====
====== 
====
June 27, 2010
       
---------------------
       
Available-for-sale securities
$  20,976 
39
20,937 
-
Derivatives
74,988 
-
66,668 
8,320
 
-------- 
-------
--------- 
-------
Total
$  95,964 
39
87,605 
8,320
 
===== 
====
====== 
====
December 26, 2010
       
---------------------
       
Available-for-sale securities
$  21,791 
24
21,767 
-
Derivatives
38,092 
-
28,937 
9,155
 
-------- 
-------
--------- 
-------
Total
$  59,883 
24
50,704 
9,155
 
===== 
====
====== 
====
Reconciliation of Level 3 Fair Value
 
2011
2010
 
-----------
-----------
Balance at beginning of year
$  9,155 
6,808 
(Loss) gain from change in fair value
(2,686)
1,512 
 
-------- 
-------- 
Balance at end of period
$  6,469 
8,320 
 
===== 
=====