Real Estate (Schedule of Fixed and Variable Lease Payments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Leases, Income Statement, Lease Revenue	$ 74,749	$ 76,527
Amortization of lease incentives	(260)	(236)
Fixed Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	67,281	68,669
Variable Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	1,326	1,364
Straight Line Rent Income [Member]
Operating Leases, Income Statement, Lease Revenue	4,241	5,177
Escrow Funds Received From Tenants [Member]
Operating Leases, Income Statement, Lease Revenue	$ 2,161	$ 1,553