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Other Comprehensive Earnings (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 25, 2011
Sep. 30, 2012
Sep. 25, 2011
Other Comprehensive Earnings (Thousands of Dollars) [Abstract]        
Tax (benefit) expense of other comprehensive earnings items related to derivative instruments designated and qualifying as cash flow hedges $ (861) $ 3,377 $ 1,000 $ (2,308)
Income tax benefit (expense) related to reclassification adjustments from other comprehensive earnings related to derivative instruments designated and qualifying as cash flow hedges (501) 477 (1,063) 251
Net deferred gains to be reclassified to earnings within the next twelve months 5,843   5,843  
Components of accumulated other comprehensive income [Abstract]        
Pension and Postretirement Amounts     (86,822) (69,925)
Current period other comprehensive earnings     0 0
Pension and Postretirement Amounts (86,822) (69,925) (86,822) (69,925)
Gains (losses) on derivative instruments     10,081 15,432
Current period other comprehensive earnings     (3,405) (13,347)
Gains (losses) on derivative instruments 6,676 2,085 6,676 2,085
Foreign currency translation adjustments     40,798 62,642
Current period other comprehensive earnings     1,113 (9,767)
Foreign currency translation adjustments 41,911 52,875 41,911 52,875
Total accumulated other comprehensive earnings (loss)     (35,943) 8,149
Other Comprehensive earnings, net change 1,408 (19,134) (2,292) (23,114)
Total accumulated other comprehensive earnings (loss) $ (38,235) $ (14,965) $ (38,235) $ (14,965)