Summary Of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) customer segment property shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Common units in operating partnership | shares			7,305,355
Number of Units in Multi-Family Asset | property			395
Cash and cash equivalents maximum benchmark (in months)			3 months
Minimum expected future benefit period on expenditures cost to be capitalized and depreciated (in years)			2 years
Minimum expected future benefit period on transaction cost to be capitalized and depreciated (in years)			1 year
Length of time criteria for expected sale of assets to be classified as properties held for disposition			12 months
Below market lease, net	$ 2,000,000.0		$ 2,000,000.0		$ 2,400,000
Below market leases, accumulated amortization	11,800,000		11,800,000		11,400,000
Impairment on assets			0	$ 0
Operating lease, right-of-use asset	1,500,000		1,500,000		1,600,000
Operating lease, liability	1,500,000		1,500,000		1,600,000
Accumulated amortization	135,000		135,000		71,000
Rental income	100,559,000	$ 107,782,000	206,775,000	215,607,000
Rental income, operating leases	77,400,000	83,800,000	159,000,000.0	166,600,000
Rental income, variable lease payments	23,200,000	$ 24,000,000.0	47,800,000	$ 49,000,000.0
Income tax expense			0
Tax benefit for uncertain tax positions			$ 0		0
Number of operating segments | segment			2
Number of reportable segments | segment			1
Net real estate investment property	1,874,283,000		$ 1,874,283,000		1,889,238,000
Properties held for sale, net	3,716,000		3,716,000		15,264,000
Deferred rent receivable	3,800,000		3,800,000
Rent receivable abated	874,000		$ 874,000
Deferred rent receivable, write-off	2,400,000
Accounts receivable, write-off	1,200,000
COVID-19 [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferral agreement, number of customers | customer			346
Deferral agreement, percentage of customers on a percentage of total rental income basis			9.80%
Deferred rent receivable	3,800,000		$ 3,800,000
Rent receivable abated	874,000		$ 874,000
Deferred rent receivable, repayment period			11 months
Reclassification [Member]
Summary Of Significant Accounting Policies [Line Items]
Net real estate investment property					(3,800,000)
Properties held for sale, net					3,800,000
Above Market Leases [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, net	950,000		$ 950,000		1,200,000
Finite-lived intangible assets, accumulated amortization	(10,800,000)		(10,800,000)		(10,600,000)
Acquired In Place Leases [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-lived intangible assets, net	4,000,000.0		4,000,000.0		5,700,000
Finite-lived intangible assets, accumulated amortization	$ 6,000,000.0		$ 6,000,000.0		$ 4,100,000
JV Partner [Member]
Summary Of Significant Accounting Policies [Line Items]
Consolidated entity ownership percentage	5.00%		5.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)			5 years
Operating lease, expiration date			2029
Operating lease, remaining lease term			9 years 3 months 18 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life (in years)			30 years
Operating lease, expiration date			2030
Operating lease, remaining lease term			9 years 7 months 6 days