Real Estate (Key Information for Leases) (Details)	3 Months Ended
	Mar. 31, 2019 property
Lease classification:
Operating	2,986
Direct financing	7
Building portion – direct financing/land portion – operating	1
Weighted average remaining lease term (years)	11 years 4 months 24 days
Minimum
Lease classification:
Initial lease terms	10 years
Maximum
Lease classification:
Initial lease terms	20 years