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Investment in Unconsolidated Entities - Under Equity Method (Details) - Equity Method Investments - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 40,472	$ 8,320
BBA-EP320 II, LLC, BBA-Ten10 II, LLC, and Lexington on the Green Apartments, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	45.00%	45.00%
Equity method investment	$ 8,948	$ 8,320
Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	45.00%	0.00%
Equity method investment	$ 16,266	$ 0
RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, and RS SWD Saltzman Owner, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	43.00%	0.00%
Equity method investment	$ 4,714	$ 0
Audubon Mezzanine Holdings, L.L.C. (Series A)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	57.00%	0.00%
Equity method investment	$ 10,544	$ 0

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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