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Investment in Unconsolidated Entities - (Details) - Equity Method Investments - USD ($) $ in Thousands | 12 Months Ended
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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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