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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2011
Significant Accounting Policies [Abstract]  
Summary Of Annual Rate Of Depreciation On Property And Equipment
     

%

Computers and peripheral equipment

   

33-50

Office furniture and equipment

    10-20

Building

    4

Leasehold improvements

    The shorter of term of the lease or the useful life of the asset
Weighted Average Assumptions Of Options Granted
     Year ended December 31,  

Employee Stock Options

    2009     2010     2011  

Expected volatility

      35.00 %      30.54 %      29.59 % 

Risk-free interest rate

      2.61 %      1.63 %      2.04 % 

Dividend yield

      0.0 %      0.0 %      0.0 % 

Expected term from vesting date (years)

      3.62        2.97        3.81   

Employee Stock Purchase Plan

                   

Expected volatility

      46.90 %      20.20 %      23.94 % 

Risk-free interest rate

      0.31 %      0.16 %      0.14 % 

Dividend yield

      0.0 %      0.0 %      0.0 % 

Expected term (years)

      0.5        0.5        0.5