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Related Party Transactions and Investments in Non-Consolidated Entities - Management fees and interest income from loans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Asset management fees, low end of range (as a percent)	1.00%
Asset management fees, high end of range (as a percent)	5.00%
Notice period for cancellation of applicable contracts	30 days
Revenue	$ 58,000	$ 136,000
Type of Revenue [Extensible List]	us-gaap:AssetManagement1Member	us-gaap:AssetManagement1Member
Sponsored REITs
Schedule of Equity Method Investments [Line Items]
Impairment of Sponsored REIT	$ 0

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High end of the range of the asset management fee as a percentage of collected rents.

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Low end of the range of the asset management fee as a percentage of collected rents.

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