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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 25, 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)
 
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--------
--------
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September 25, 2011
       
---------------------
       
Available-for-sale securities
$  20,119       
24         
20,095        
-     
Derivatives
28,084       
-         
25,204        
2,880     
 
--------       
-------         
---------        
-------     
Total
$  48,203       
24         
45,299        
2,880     
 
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====         
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September 26, 2010
       
---------------------
       
Available-for-sale securities
$  21,395       
41         
21,354        
-     
Derivatives
28,547       
-         
22,566        
5,981     
 
--------       
-------         
---------        
-------     
Total
$  49,942       
41         
43,920        
5,981     
 
=====       
====         
=====        
====     
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     
 
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Reconciliation of Level 3 Fair Value

 
2011
2010
 
-----------
-----------
Balance at beginning of year
$  9,155    
6,808    
Loss from change in fair value
(6,275)   
(827)   
 
--------    
--------   
Balance at end of period
$  2,880    
5,981    
 
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