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Investment in Unconsolidated Entities - (Details) - Equity Method Investments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 8,320	$ 18,927
Equity method investment, fair value	$ 42,823	$ 60,332
Autumnwood Investments LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	0.00%	0.00%
Equity method investment	$ 0	$ 2,092
Changes in fair value, gain (loss)	$ 265	$ 260	$ 281
200 RHC Hoover, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	0.00%	63.00%
Equity method investment	$ 0	$ 8,886
Changes in fair value, gain (loss)	$ 275	$ 1,370	394
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]
Equity method investment, ownership interest	45.00%	45.00%
Equity method investment	$ 8,320	$ 7,949
Changes in fair value, gain (loss)	996	433	0
RiverBanc LLC (RiverBanc)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	125	815
Kiawah River View Investors LLC (KRVI)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	1,250	866
RB Development Holding Company, LLC (RBDHC)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	0	107	(9)
RB Multifamily Investors LLC (RBMI)
Schedule of Equity Method Investments [Line Items]
Changes in fair value, gain (loss)	$ 0	$ 2,262	5,263
Morrocroft Neighborhood Stabilization Fund II, LP
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	11.00%	11.00%
Equity method investment, fair value	$ 12,623	$ 9,732
Changes in fair value, gain (loss)	$ 1,591	$ 910	254
Evergreens JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	85.00%	85.00%
Equity method investment, fair value	$ 4,220	$ 3,810
Changes in fair value, gain (loss)	$ 571	$ 199	0
Bent Tree JV Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	0.00%	78.00%
Equity method investment, fair value	$ 0	$ 9,890
Changes in fair value, gain (loss)	$ 1,795	$ 411	0
Summerchase LR Partners LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	0.00%	80.00%
Equity method investment, fair value	$ 0	$ 4,410
Changes in fair value, gain (loss)	$ 569	$ 380	0
Lake Mary Realty Partners, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	0.00%	80.00%
Equity method investment, fair value	$ 0	$ 7,690
Changes in fair value, gain (loss)	$ 2,745	$ 554	0
The Preserve at Port Royal Venture, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	77.00%	77.00%
Equity method investment, fair value	$ 13,040	$ 12,280
Changes in fair value, gain (loss)	$ 1,729	$ 834	0
WR Savannah Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership interest	90.00%	90.00%
Equity method investment, fair value	$ 12,940	$ 12,520
Changes in fair value, gain (loss)	$ 1,386	$ 692	$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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