Real Estate (Classification of Investment Property Leases) (Details)	9 Months Ended
	Sep. 30, 2015 property option lease
Lease classification:
Weighted average remaining lease term (years)	11 years 6 months
Number of renewal options, or more | option	1
Operating
Lease classification:
Number of properties leased-operating | lease	2,270
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