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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Oct. 04, 2014
Sep. 28, 2013
Restructuring Reserve [Roll Forward]    
Payments $ (2,323) $ (1,977)
2013 restructuring
    
Restructuring Reserve [Roll Forward]    
Balance at January 4, 2014 3,478  
Assumption changes (142)  
Payments (2,000)  
Balance at October 4, 2014 1,336  
2013 restructuring | Reduction in Force Activities
    
Restructuring Reserve [Roll Forward]    
Balance at January 4, 2014 2,550  
Assumption changes (168)  
Payments (1,690)  
Balance at October 4, 2014 692  
2013 restructuring | Facility Lease Obligation
    
Restructuring Reserve [Roll Forward]    
Balance at January 4, 2014 928  
Assumption changes 26  
Payments (310)  
Balance at October 4, 2014 $ 644