Real Estate (Classification of Investment Property Leases) (Details)	12 Months Ended
	Dec. 31, 2016 property
Lease classification:
Weighted average remaining lease term (years)	11 years 7 months
Operating
Lease classification:
Operating	2,566
Direct financing
Lease classification:
Direct financing	9
Building portion – direct financing/land portion – operating
Lease classification:
Building portion – direct financing/land portion – operating	2