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Acquisitions (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Contingent compensation expenses        
Total contingent compensation expense $ 1,496 $ 496 $ 4,804 $ 5,326
IPR&D, included in acquisition related (gain) expense, net    0    5,425
Research and Development Expense [Member]
       
Contingent compensation expenses        
Total contingent compensation expense 754 775 2,218 4,067
Selling General and Administrative Expense [Member]
       
Contingent compensation expenses        
Total contingent compensation expense $ 742 $ (279) $ 2,586 $ 1,259