Real Estate (Classification of Investment Property Leases) (Details)	3 Months Ended
	Mar. 31, 2016 property option
Lease classification:
Weighted average remaining lease term (years)	11 years 3 months 19 days
Number of renewal options, or more | option	1
Operating
Lease classification:
Number of properties leased-operating	2,330
Direct financing
Lease classification:
Number of properties leased-direct financing	10
Building portion – direct financing/land portion – operating
Lease classification:
Number of properties leased-building portion-direct financing land portion-operating	2