Real Estate - Portfolio (Classification Of Investment Property Leases) (Details)	3 Months Ended
	Mar. 31, 2013
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-operating	1,637
Direct Financing [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased-direct financing	13
Building Portion - Direct Financing / Land Portion - Operating [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties leased-building portion-direct financing land portion-operating	5