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Investments in Unconsolidated Entities (Details) - Equity Method Investments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Carrying Amount	$ 55,789		$ 40,472
Carrying Amount, fair value option	$ 36,575		$ 32,994
BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	45.00%		45.00%
Carrying Amount	$ 9,217		$ 8,948
Income from investments in unconsolidated entities	$ 275	$ 253
Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	45.00%		45.00%
Carrying Amount	$ 16,504		$ 16,266
Income from investments in unconsolidated entities	$ 478	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%		43.00%
Carrying Amount	$ 4,752		$ 4,714
Income from investments in unconsolidated entities	$ 131	0
Audubon Mezzanine Holdings, LLC (Series A)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	57.00%		57.00%
Carrying Amount	$ 10,701		$ 10,544
Income from investments in unconsolidated entities	$ 297	0
EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	46.00%		0.00%
Carrying Amount	$ 6,612		$ 0
Income from investments in unconsolidated entities	$ 165	0
Walnut Creek Properties Holdings, L.L.C.
Schedule of Equity Method Investments [Line Items]
Ownership Interest	36.00%		0.00%
Carrying Amount	$ 8,003		$ 0
Income from investments in unconsolidated entities	$ 98	0
Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Ownership Interest	11.00%		11.00%
Carrying Amount, fair value option	$ 11,185		$ 10,954
Income from investments in unconsolidated entities	$ 232	282
Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	85.00%		85.00%
Carrying Amount, fair value option	$ 11,340		$ 8,200
Income from investments in unconsolidated entities	$ 3,224	194
The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	77.00%		77.00%
Carrying Amount, fair value option	$ 14,050		$ 13,840
Income from investments in unconsolidated entities	438	483
WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	$ 0	$ 361

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