Summary Of Significant Accounting Policies (Schedule Of Useful Life Of Property And Equipment) (Details)	12 Months Ended
	Dec. 31, 2011
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Minimum number of useful life in years	5
Maximum number of useful life in years	20
Building And Improvements [Member]
Property, Plant and Equipment [Line Items]
Minimum number of useful life in years	5
Maximum number of useful life in years	50
Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Minimum number of useful life in years	3
Maximum number of useful life in years	5
Office Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Average number of useful life in years	5