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Balance Sheet Components (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Jul. 03, 2012
Dec. 31, 2011
Balance Sheet Components [Line Items]            
Cost Method Investments $ 1,300,000   $ 1,300,000     $ 3,000,000
Cost-method Investments, Realized Gains     3,126,000 0    
Depreciation 3,200,000 2,500,000 8,700,000 7,400,000    
Acquired Finite-lived Intangible Asset, Amount         4,000,000  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 1,200,000   1,200,000   2,000,000  
Goodwill, Acquired During Period     14,936,000      
Amortization expense 1,400,000 1,200,000 3,400,000 3,700,000    
Minimum [Member]
           
Balance Sheet Components [Line Items]            
Available-for-sale Securities, Maturity Period ( in months)     3 months      
Maximum [Member]
           
Balance Sheet Components [Line Items]            
Available-for-sale Securities, Maturity Period ( in months)     12 months      
Retail [Member]
           
Balance Sheet Components [Line Items]            
Goodwill, Acquired During Period     11,895,000      
Commercial [Member]
           
Balance Sheet Components [Line Items]            
Goodwill, Acquired During Period     3,041,000      
Avaak Inc. [Member] | In-Process Research and Development [Member]
           
Balance Sheet Components [Line Items]            
In Process Research and Development achieving technological feasibility         800,000  
Future Cost to Complete In-Process Research and Development         $ 400,000