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Commitments And Contingencies (Narrative) (Details) (USD $)
0 Months Ended 1 Months Ended 2 Months Ended 9 Months Ended 9 Months Ended
Aug. 06, 2011
additional_companies
companies
Mar. 25, 2010
Oct. 31, 2008
companies
Jan. 31, 2008
technology_companies
Jul. 03, 2012
Sep. 30, 2012
May 09, 2012
claims
Nov. 26, 2011
patents
Nov. 16, 2011
patents
actions
May 23, 2011
Mar. 03, 2011
claims
Sep. 14, 2010
patents
Sep. 30, 2012
46 To 60 Days [Member]
Sep. 30, 2012
31 To 45 Days [Member]
Sep. 30, 2012
Minimum [Member]
46 To 60 Days [Member]
Sep. 30, 2012
Minimum [Member]
31 To 45 Days [Member]
Sep. 30, 2012
Maximum [Member]
46 To 60 Days [Member]
Sep. 30, 2012
Maximum [Member]
31 To 45 Days [Member]
Sep. 30, 2012
Chief Executive Officer [Member]
Sep. 30, 2012
Senior Vice President Of Worldwide Operations And Support [Member]
Sep. 30, 2012
Other Key Executives [Member]
Apr. 03, 2012
Litigation Filed [Member]
patents
Commitments And Contingencies [Line Items]                                            
Operating leases expiration date           Dec. 31, 2026                                
Percentage of cancelable orders                         50.00% 25.00%                
Required notice period prior to the expected shipment date (in days)                             46 days 31 days 60 days 45 days        
Number of days for non-cancellation of purchase obligations prior to expected shipment date (in days)           30 days                                
Non-cancelable purchase commitments           $ 177,000,000                                
Number of weeks for which salary is payable upon termination of employment without cause (in days)                                     364 days 273 days 182 days  
Continued vesting period after termination without cause (in years)           1 year                                
Number of years after change of control to trigger full accelerated vest of unvested portion of stock options (in years)                                     1 year      
Maximum number of years covered by accelerated vest for other key executives if term without cause is within one year of change in control (in years)                                         2 years  
Number of other technology companies sued for patent infringement (in technology companies)       6                                    
Amount of defendants' joint request for costs which have not been collected or recognized                   $ 103,000                        
Recurring Period That Courts Instructed Parties to Submit Status Reports By ( in months)   6 months                                        
Maximum number of asserted claims in filed status report ( in claims)             10                              
Number of other companies lawsuit was filed against (in companies) 16   30                                      
Number of patents company is accused of infringing (in patents)               6       8                    
Number of wired claims rejected in the patent (in claims)                     5                      
Number of additional companies sued in a separate suit (in additional companies) 14                                          
Number of patents in which company filed judgement action for nonInfringement and invalidity (in patents)                 17                          
Number of actions brought against end user customers and other companies (in actions)                 15                          
Length of trial period (in days)         10 days                                  
Number of patents company filed suit for infringement of (in patents)                                           4