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Significant Accounting Policies (Summary Of Annual Rate Of Depreciation On Property And Equipment) (Details)
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Line Items]  
Leasehold improvements The shorter of term of the lease or the useful life of the asset
Computers And Peripheral Equipment [Member] | Minimum [Member]
 
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 33.00%
Computers And Peripheral Equipment [Member] | Maximum [Member]
 
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 50.00%
Office Furniture And Equipment [Member] | Minimum [Member]
 
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 10.00%
Office Furniture And Equipment [Member] | Maximum [Member]
 
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 20.00%
Building [Member]
 
Property, Plant and Equipment [Line Items]  
Annual rate of depreciation on property and equipment 4.00%