Real Estate (Schedule of Fixed and Variable Lease Payments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Leases, Income Statement, Lease Revenue	$ 77,917	$ 72,578	$ 154,444	$ 143,531
Fixed Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	69,669	64,570	138,103	128,033
Variable Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	1,400	1,195	2,764	2,366
Straight Line Rent Income [Member]
Operating Leases, Income Statement, Lease Revenue	5,218	5,307	10,395	10,535
Escrow Funds Received From Tenants [Member]
Operating Leases, Income Statement, Lease Revenue	$ 1,630	$ 1,506	$ 3,182	$ 2,597