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Derivatives and Hedging Activities (Details 3) (Foreign exchange contracts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Foreign exchange contracts [Member]
       
Derivative Instruments, Gain (Loss)        
Foreign exchange contracts $ (1,136) $ (584) $ (6,382) $ (3,025)