Real Estate (Classification of Investment Property Leases) (Details)	6 Months Ended
	Jun. 30, 2017 property option
Lease classification:
Weighted average remaining lease term (years)	11 years 6 months 9 days
Number of renewal options, or more | option	1
Operating
Lease classification:
Operating	2,713
Direct financing
Lease classification:
Direct financing	7
Building portion – direct financing/land portion – operating
Lease classification:
Building portion – direct financing/land portion – operating	2