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Summary Accounting Policies - Leases - As Lessor (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lessor
Operating Lease, Option to extend	true
Operating Lease, Option to terminate	true
Components of lease revenues
Fixed lease revenues	$ 17,645,000
Variable lease revenues	3,256,000
Lease revenues	20,901,000
Amortization of intangibles relating to leases, net	254,000	$ 240,000
Revenues	$ 21,155,000	19,534,000
Tenant reimbursements
Components of lease revenues
Revenues		$ 1,944,000

X

- Definition

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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- Definition

Indicates (true false) whether lessor has option to extend operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

+ References

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-SubTopic 30
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Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

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Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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