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Revenues - Contract Balances (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract Assets Activity [Roll Forward]
Balance at beginning of period	$ 460,000
Tenant openings	(151,000)
Executed leases	212,000
Balance at end of period	521,000
Investments in unconsolidated affiliates				$ 166,000
Increase (decrease) in contract with customer liability	0
Contract with Customer, Liability [Abstract]
Contract with customer - asset	$ 460,000	$ 521,000		$ 460,000
Contract with customer - asset - remainder of 2018		(366,000)
Contract with customer - asset - 2019		(151,000)
Contract with customer - asset - 2023		(4,000)
Contract with customer - liability		98,000	$ 98,000
Lease commission recognized upon tenant opening (as a percent)	50.00%
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer - liability		0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer - liability		$ (49,000)
Expected timing of satisfaction of remaining performance obligation		6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer - liability		$ (49,000)
Expected timing of satisfaction of remaining performance obligation		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer - liability		$ 0
Expected timing of satisfaction of remaining performance obligation		1 year

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