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Balance Sheet Information (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Intangible Assets      
Gross intangible assets $ 128,883 $ 121,207  
Less accumulated amortization (103,001) (104,314)  
Intangible assets, net 25,882 16,893  
Estimated aggregate amortization expense      
2012 4,538    
2013 3,286    
2014 2,961    
2015 2,859    
2016 2,671    
Accrued Expenses      
Payroll and related benefits 19,017 27,374  
Sales, use, income and other taxes 6,315 4,914  
Customer deposits and advanced billings 57,075 129,225  
Warranty 9,778 9,238  
Restructuring liability 956 714 2,165
Other 14,515 11,545  
Total 107,656 183,010  
Accrued Warranty      
Balance as of the beginning of period 9,238 6,675  
Warranties issued during the period 12,465 9,695  
Settlements made during the period (11,925) (7,132)  
Balance as of the end of period 9,778 9,238  
Purchased technology
      
Intangible Assets      
Gross intangible assets 109,248 98,473  
Less accumulated amortization (89,620) (86,376)  
Intangible assets, net 19,628 12,097  
Other intangible assets
      
Intangible Assets      
Gross intangible assets 19,635 22,734  
Less accumulated amortization (13,381) (17,938)  
Intangible assets, net $ 6,254 $ 4,796