Real Estate - Portfolio (Classification Of Investment Property Leases) (Details)	12 Months Ended
	Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items]
Weighted Average Remaining Lease Term In Years	12 years
Operating [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased	1,377
Direct Financing [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased	15
Building Portion - Direct Financing / Land Portion - Operating [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased	5