Real Estate - Investment Portfolio (Classification Of Investment Property Leases) (Details)	6 Months Ended
	Jun. 30, 2011 years
Weighted average remaining lease term (in years)	12
Operating [Member]
Number of properties leased	1,213
Direct Financing [Member]
Number of properties leased	16
Building Portion - Direct Financing / Land Portion - Operating [Member]
Number of properties leased	6