Summary Of Significant Accounting Policies (Schedule Of Useful Lives Of Property And Equipment) (Details)	12 Months Ended
	Dec. 31, 2011 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets, years	3
Purchased And Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets, Minimum, years	3
Estimated useful life of assets, Maximum, years	5
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets, description	Shorter of useful life or life of lease
Machinery, Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets, Minimum, years	3
Estimated useful life of assets, Maximum, years	6