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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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