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Investments in Unconsolidated Entities - (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in unconsolidated entities | $ 189,965 | $ 73,466 |  | $ 107,477
Equity Method Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in unconsolidated entities | 106,083 | 40,472 |  |
Equity method investment, fair value | $ 83,882 | $ 32,994 |  |
Equity Method Investments | 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% |  |
Investments in unconsolidated entities | $ 10,108 | $ 8,948 |  |
Changes in fair value, gain (loss) | $ 1,167 | $ 1,050 | $ 996 |
Equity Method Investments | Somerset Deerfield Investor, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 45.00% | 45.00% |  |
Investments in unconsolidated entities | $ 17,417 | $ 16,266 |  |
Changes in fair value, gain (loss) | $ 1,992 | $ 251 | 0 |
Equity Method Investments | RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, LLC and RS SWD Saltzman Owner, LLC (collectively) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 43.00% | 43.00% |  |
Investments in unconsolidated entities | $ 4,878 | $ 4,714 |  |
Changes in fair value, gain (loss) | $ 539 | $ 76 | 0 |
Equity Method Investments | Audubon Mezzanine Holdings, L.L.C. (Series A) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 57.00% | 57.00% |  |
Investments in unconsolidated entities | $ 10,998 | $ 10,544 |  |
Changes in fair value, gain (loss) | $ 1,224 | $ 59 | 0 |
Equity Method Investments | 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] |  |  |  |
Equity method investment, ownership interest | 46.00% | 0.00% |  |
Investments in unconsolidated entities | $ 6,847 | $ 0 |  |
Changes in fair value, gain (loss) | $ 741 | $ 0 | 0 |
Equity Method Investments | Walnut Creek Properties Holdings, L.L.C. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 36.00% | 0.00% |  |
Investments in unconsolidated entities | $ 8,288 | $ 0 |  |
Changes in fair value, gain (loss) | $ 803 | $ 0 | 0 |
Equity Method Investments | Towers Property Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 37.00% | 0.00% |  |
Investments in unconsolidated entities | $ 11,278 | $ 0 |  |
Changes in fair value, gain (loss) | $ 638 | $ 0 | 0 |
Equity Method Investments | Mansions Property Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 34.00% | 0.00% |  |
Investments in unconsolidated entities | $ 10,867 | $ 0 |  |
Changes in fair value, gain (loss) | $ 615 | $ 0 | 0 |
Equity Method Investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 43.00% | 0.00% |  |
Investments in unconsolidated entities | $ 4,062 | $ 0 |  |
Changes in fair value, gain (loss) | $ 188 | $ 0 | 0 |
Equity Method Investments | 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] |  |  |  |
Equity method investment, ownership interest | 37.00% | 0.00% |  |
Investments in unconsolidated entities | $ 9,396 | $ 0 |  |
Changes in fair value, gain (loss) | $ 367 | $ 0 | 0 |
Equity Method Investments | 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] |  |  |  |
Equity method investment, ownership interest | 53.00% | 0.00% |  |
Investments in unconsolidated entities | $ 11,944 | $ 0 |  |
Changes in fair value, gain (loss) | 267 | 0 | 0 |
Equity Method Investments | Autumnwood Investments LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in fair value, gain (loss) | 0 | 0 | 265 |
Equity Method Investments | 200 RHC Hoover, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in fair value, gain (loss) | $ 0 | $ 0 | 275 |
Equity Method Investments | Evergreens JV Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 0.00% | 85.00% |  |
Equity method investment, fair value | $ 0 | $ 8,200 |  |
Changes in fair value, gain (loss) | $ 5,107 | $ 4,312 | 571 |
Equity Method Investments | 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 | $ 18,310 | $ 13,840 |  |
Changes in fair value, gain (loss) | 5,374 | 1,778 | 1,729 |
Equity Method Investments | WR Savannah Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in fair value, gain (loss) | 0 | 1,854 | 1,386 |
Equity Method Investments | Bent Tree JV Holdings, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in fair value, gain (loss) | 0 | 0 | 1,795 |
Equity Method Investments | Summerchase LR Partners LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in fair value, gain (loss) | 0 | 0 | 569 |
Equity Method Investments | Lake Mary Realty Partners, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Changes in fair value, gain (loss) | $ 0 | $ 0 | 2,745 |
Equity Method Investments | 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 | $ 11,796 | $ 10,954 |  |
Changes in fair value, gain (loss) | $ 843 | $ 1,131 | 1,591 |
Equity Method Investments | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 49.00% | 0.00% |  |
Equity method investment, fair value | $ 53,776 | $ 0 |  |
Changes in fair value, gain (loss) | $ 3,776 | $ 0 | $ 0 |

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