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Balance Sheet Information (Details 6) (USD $)
 0 Months Ended 12 Months Ended
Sep. 28, 2010
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible Assets          
Gross intangible assets   $ 228,153,000 $ 128,883,000    
Less accumulated amortization   (113,437,000) (107,909,000)    
Intangible assets, net   114,716,000 20,974,000    
Estimated aggregate amortization expense          
2014   11,569,000      
2015   19,376,000      
2016   18,498,000      
2017   15,876,000      
2018   12,244,000      
Other Assets          
Cost method investment   16,884,000 14,494,000    
Income taxes receivable   21,128,000      
Other   714,000 2,287,000    
Other assets   38,726,000 16,781,000    
Cost Method Investment          
Cost method investments 3,000,000 2,391,000 10,341,000 1,200,000  
Interest rate on bridge notes   4.00%      
Percentage ownership of preferred shares   15.40%      
Percentage ownership of cost method investee   11.00%      
Accrued Expenses and Other Current Liabilities          
Payroll and related benefits   11,020,000 14,581,000    
Sales, use and other taxes   5,402,000 6,480,000    
Contingent consideration   20,098,000      
Warranty   5,662,000 4,942,000    
Restructuring liability   533,000 1,875,000   714,000
Other   8,369,000 13,523,000    
Total   51,084,000 41,401,000    
Customer deposits and deferred revenue          
Customer deposits   27,500,000 32,700,000    
Warranty period of products purchased   1 year      
Accrued Warranty          
Balance as of the beginning of period   4,942,000 8,731,000    
Warranties issued during the period   5,291,000 3,563,000    
Settlements made during the period   (15,580,000) (7,060,000)    
Changes in estimates   1,009,000 (292,000)    
Balance as of the end of period   5,662,000 4,942,000 8,731,000  
Other Liabilities          
Contingent consideration   9,270,000      
Income taxes payable     3,986,000    
Other   379,000 544,000    
Other liabilities   9,649,000 4,530,000    
Purchased technology
          
Intangible Assets          
Gross intangible assets   187,478,000 109,248,000    
Less accumulated amortization   (97,524,000) (93,436,000)    
Intangible assets, net   89,954,000 15,812,000    
Other intangible assets
          
Intangible Assets          
Gross intangible assets   40,675,000 19,635,000    
Less accumulated amortization   (15,913,000) (14,473,000)    
Intangible assets, net   $ 24,762,000 $ 5,162,000