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Stock Plans and Stock Based Compensation (Stock Based Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 25, 2011
Jun. 30, 2012
Jun. 25, 2011
Stock-based compensation expense        
Stock-based compensation expense $ 5,321 $ 5,430 $ 10,586 $ 11,348
Provision for income taxes (1,884) (1,940) (3,768) (4,058)
Net income attributable to common shareowners 3,437 3,490 6,818 7,290
Cost of Sales [Member]
       
Stock-based compensation expense        
Stock-based compensation expense 2,345 1,700 3,792 3,378
Selling and Administration [Member]
       
Stock-based compensation expense        
Stock-based compensation expense 2,976 3,730 6,794 7,970
Performance Based Stock Award Program [Member]
       
Stock-based compensation expense        
Stock-based compensation expense $ 0 $ 54