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Other Comprehensive Earnings (Tables)
9 Months Ended
Sep. 30, 2012
Other Comprehensive Earnings (Thousands of Dollars) [Abstract]  
Schedule of comprehensive earnings (loss)
 
Pension and Postretirement Amounts
Gains (Losses) on Derivative Instruments
Foreign Currency Translation Adjustments
Total Accumulated Other Comprehensive Earnings (Loss)
2012
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Balance at Dec. 25, 2011
$   (86,822)                
10,081             
40,798               
(35,943)                  
 
Current period other comprehensive earnings (loss)
 
-                  
 
(3,405)            
 
1,113               
 
(2,292)                  
 
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Balance at Sept. 30, 2012
$   (86,822)                
6,676             
41,911               
(38,235)                  
 
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2011
       
Balance at Dec. 26, 2010
$   (69,925)                
15,432             
62,642               
8,149                   
 
Current period other comprehensive earnings (loss)
 
-                 
 
(13,347)            
 
(9,767)              
 
(23,114)                  
 
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Balance at Sept. 25, 2011
$   (69,925)                
2,085             
52,875               
(14,965)                  
 
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