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Investments in Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 211,965		$ 189,965
Other income	2,035	$ 7,728
Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Other income	(4,300)
Investment in unconsolidated entities
Schedule of Equity Method Investments [Line Items]
Fair Value	85,100		$ 83,882
Other income	200	3,700
Investment in unconsolidated entities | 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]
Income from investments in unconsolidated entities	245	275
Investment in unconsolidated entities | Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	159	478
Investment in unconsolidated entities | 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]
Income from investments in unconsolidated entities	(66)	131
Investment in unconsolidated entities | Audubon Mezzanine Holdings, LLC (Series A)
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(109)	297
Investment in unconsolidated entities | 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]
Income from investments in unconsolidated entities	(101)	165
Investment in unconsolidated entities | Walnut Creek Properties Holdings, L.L.C.
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(94)	98
Investment in unconsolidated entities | Towers Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(161)	0
Investment in unconsolidated entities | Mansions Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(155)	0
Investment in unconsolidated entities | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively)
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(54)	0
Investment in unconsolidated entities | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively)
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(131)	0
Investment in unconsolidated entities | Axis Apartments Holdings, LLC, Arbor-Stratford Holdings II, LLC - Series B, Highlands - Mtg. Holdings, LLC - Series B, Oakley Shoals Apartments, LLC - Series C, and Woodland Park Apartments II, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(169)	0
Investment in unconsolidated entities | DCP Gold Creek, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(120)	0
Investment in unconsolidated entities | 1122 Chicago DE, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	(60)	0
Investment in unconsolidated entities | Rigsbee Ave Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	$ (147)	0
Investment in unconsolidated entities | The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	77.00%		77.00%
Fair Value	$ 18,310		$ 18,310
Income from investments in unconsolidated entities	$ 239	438
Investment in unconsolidated entities | Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Ownership Interest	11.00%		11.00%
Fair Value	$ 12,014		$ 11,796
Income from investments in unconsolidated entities	$ 218	232
Investment in unconsolidated entities | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	49.00%		49.00%
Fair Value	$ 54,776		$ 53,776
Income from investments in unconsolidated entities	1,000	0
Investment in unconsolidated entities | Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Income from investments in unconsolidated entities	0	$ 3,224
Investment in unconsolidated entities | Preferred Equity Ownership Interests
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 126,865
Investments in unconsolidated entities			$ 106,083
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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%
Fair Value	$ 10,491
Investments in unconsolidated entities			$ 10,108
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Somerset Deerfield Investor, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	45.00%		45.00%
Fair Value	$ 17,385
Investments in unconsolidated entities			$ 17,417
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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%
Fair Value	$ 4,804
Investments in unconsolidated entities			$ 4,878
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Audubon Mezzanine Holdings, LLC (Series A)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	57.00%		57.00%
Fair Value	$ 10,764
Investments in unconsolidated entities			$ 10,998
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 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%		46.00%
Fair Value	$ 6,693
Investments in unconsolidated entities			$ 6,847
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Walnut Creek Properties Holdings, L.L.C.
Schedule of Equity Method Investments [Line Items]
Ownership Interest	36.00%		36.00%
Fair Value	$ 8,200
Investments in unconsolidated entities			$ 8,288
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Towers Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	37.00%		37.00%
Fair Value	$ 11,174
Investments in unconsolidated entities			$ 11,278
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Mansions Property Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	34.00%		34.00%
Fair Value	$ 10,767
Investments in unconsolidated entities			$ 10,867
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	43.00%		43.00%
Fair Value	$ 4,023
Investments in unconsolidated entities			$ 4,062
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	37.00%		37.00%
Fair Value	$ 9,278
Investments in unconsolidated entities			$ 9,396
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Axis Apartments Holdings, LLC, Arbor-Stratford Holdings II, LLC - Series B, Highlands - Mtg. Holdings, LLC - Series B, Oakley Shoals Apartments, LLC - Series C, and Woodland Park Apartments II, LLC (collectively)
Schedule of Equity Method Investments [Line Items]
Ownership Interest	53.00%		53.00%
Fair Value	$ 11,505
Investments in unconsolidated entities			$ 11,944
Investment in unconsolidated entities | Preferred Equity Ownership Interests | DCP Gold Creek, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	44.00%		0.00%
Fair Value	$ 5,806
Investments in unconsolidated entities			$ 0
Investment in unconsolidated entities | Preferred Equity Ownership Interests | 1122 Chicago DE, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	53.00%		0.00%
Fair Value	$ 6,633
Investments in unconsolidated entities			$ 0
Investment in unconsolidated entities | Preferred Equity Ownership Interests | Rigsbee Ave Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership Interest	56.00%		0.00%
Fair Value	$ 9,342
Investments in unconsolidated entities			$ 0

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