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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2011
Guarantees [Abstract]  
Summary of warranty accrual included in accrued liabilities
                         
    Year ended December 31,  
    2011     2010     2009  
    (In thousands)  

Balance at beginning of period

   $ 4,811     $ 4,186     $ 5,361  

Acquired warranty obligation from Scopus acquisition

     —         —         2,379  

Acquired warranty obligation from Omneon acquisition

     —         949       —    

Accrual for current period warranties

     8,245       4,898       991  

Warranty costs incurred

     (7,498 )      (5,222 )      (4,545 ) 
   

 

 

    

 

 

    

 

 

  

Balance at end of period

   $ 5,558     $ 4,811     $ 4,186