Summary of Significant Accounting Policies (Schedule of Intangible Assets & Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Accumulated Amortization	$ (60,794)	$ (58,659)
Intangible lease assets, net	57,282	61,025
Intangible Lease Origination Costs, Accumulated Amortization	(33,952)	(33,731)
Intangible Lease Origination Costs, Net	26,386	27,971
Below Market Lease, Gross	36,287	36,966
Below Market Lease, Accumulated Amortization	(16,043)	(15,127)
Below Market Lease, Net	20,244	21,839
Above-Market In-Place Lease Assets
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	2,480	2,481
Intangible Lease Assets, Accumulated Amortization	(1,245)	(1,202)
Intangible lease assets, net	1,235	1,279
Absorption Period Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Assets, Gross	115,596	117,203
Intangible Lease Assets, Accumulated Amortization	(59,549)	(57,457)
Intangible lease assets, net	56,047	59,746
Intangible Lease Origination Costs
Gross Intangible In-Place Lease Assets and Liabilities [Abstract]
Intangible Lease Origination Costs, Gross	60,338	61,702
Intangible Lease Origination Costs, Accumulated Amortization	(33,952)	(33,731)
Intangible Lease Origination Costs, Net	$ 26,386	$ 27,971