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Derivatives and Hedging Activities (Details 3) (Foreign exchange contracts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Foreign exchange contracts [Member]
       
Derivative Instruments, Gain (Loss)        
Foreign exchange contracts $ (139) $ (799) $ (446) $ (5,246)