Investment Property (Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Net
Net	$ 98,537	$ 90,697
Out-of-Market Lease Liabilities
Out-of-Market Lease Liabilities, Cost	(25,579)	(22,318)
Out-of-Market Lease Liabilities, Less: accumulated amortization	5,946	4,284
Out-of-Market Lease Liabilities, Net	(19,633)	(18,034)
In-Place Leases
Finite-Lived Intangible Assets, Net
Cost	136,215	118,585
Less: accumulated amortization	(43,808)	(31,320)
Net	92,407	87,265
Out-of-Market Lease Assets
Finite-Lived Intangible Assets, Net
Cost	8,957	5,558
Less: accumulated amortization	(2,827)	(2,126)
Net	$ 6,130	$ 3,432