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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 05, 2014
Restructuring Cost and Reserve [Line Items]  
Balance at January 4, 2014 $ 3,478
Charges   
Assumption changes (27)
Payments (603)
Accretion of Liability 8
Balance at April 5, 2014 2,856
2013 Facility Lease Obligation and Severance Costs | Reduction in Force Activities
  
Restructuring Cost and Reserve [Line Items]  
Balance at January 4, 2014 2,550
Charges   
Assumption changes (29)
Payments (500)
Accretion of Liability   
Balance at April 5, 2014 2,021
2013 Facility Lease Obligation and Severance Costs | Facility Lease Obligation
  
Restructuring Cost and Reserve [Line Items]  
Balance at January 4, 2014 928
Charges   
Assumption changes 2
Payments (103)
Accretion of Liability 8
Balance at April 5, 2014 $ 835