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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2012
Dec. 31, 2011
Summary of expected future amortization    
Remainder of 2012 $ 4,640  
2013 18,561  
2014 18,561  
2015 18,561  
2016 5,805  
2017 813  
Net, amortizable intangible assets $ 66,941 $ 63,778