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Restructuring Charges (Tables)
12 Months Ended
Dec. 31, 2011
Restructuring Charges [Abstract]  
Restructuring Liabilities Related To Plan
    SEVERANCE & RELATED     PROFESSIONAL FEES        
(THOUSANDS OF DOLLARS)   EXPENSES     & OTHER     TOTAL  
Balances at January 3, 2009 $ 772   $ 61   $ 833  
Restructuring charges incurred   1,517     343     1,860  
Cash payments   (1,618 )   (308 )   (1,926 )
Foreign exchange effects   5     (1 )   4  
Balances at January 2, 2010 $ 676   $ 95   $ 771  
Cash payments   (676 )   (95 )   (771 )
Balances at January 1, 2011 and December 31, 2011 $ -   $ -   $ -