Real Estate Real Estate (Schedule of Fixed and Variable Lease Payments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Leases, Income Statement, Lease Revenue	$ 75,247	$ 71,688	$ 218,777	$ 210,809
Fixed Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	67,172	64,884	196,411	190,267
Variable Lease Escalation [Member]
Operating Leases, Income Statement, Lease Revenue	747	1,085	1,906	3,026
Straight Line Rent Income [Member]
Operating Leases, Income Statement, Lease Revenue	5,720	5,719	16,255	17,516
Escrow Funds Received From Tenants [Member]
Operating Leases, Income Statement, Lease Revenue	$ 1,608	$ 0	$ 4,205	$ 0