Summary Of Significant Accounting Policies (Property And Equipment) (Details)	12 Months Ended
	Dec. 31, 2011
Computer Hardware [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum (in years)	2
Estimated useful lives, maximum (in years)	3
Computer Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, minimum (in years)	2
Estimated useful lives, maximum (in years)	5
Furniture And Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, average (in years)	5
Leasehold Improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, maximum (in years)	5