Real Estate (Schedule of Fixed and Variable Lease Payments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Leases, Income Statement, Lease Revenue	$ 77,821	$ 75,247	$ 232,266	$ 218,777
Fixed Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	67,342	66,671	205,444	194,706
Variable Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	1,386	1,248	4,151	3,611
Straight Line Rent Income [Member]
Operating Leases, Income Statement, Lease Revenue	5,086	5,720	15,481	16,255
Escrow Funds Received From Tenants [Member]
Operating Leases, Income Statement, Lease Revenue	$ 4,007	$ 1,608	$ 7,190	$ 4,205