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Equity Investments - (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments | $ 259,095 | $ 189,965 |
Other income (losses) | 1,097 | 2,420 | $ 12,146
Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | 300 |  |
Joint Venture Equity Investments In Multi-family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | (9,700) | 300 | 4,000
Realized (losses) gains, net | 8,800 | 10,200 | 4,000
Equity Method Investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value | 76,330 | 83,882 |
Changes in fair value, gain (loss) | 16,587 | 8,541 | 1,436
Equity Method Investments | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair Value | 182,765 |  |
Equity investments |  | 106,083 |
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] |  |  |
Changes in fair value, gain (loss) | $ 1,260 | $ 1,167 | 1,050
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) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 45.00% | 45.00% |
Fair Value | $ 11,441 |  |
Equity investments |  | $ 10,108 |
Equity Method Investments | Somerset Deerfield Investor, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 2,168 | $ 1,992 | 251
Equity Method Investments | Somerset Deerfield Investor, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 45.00% | 45.00% |
Fair Value | $ 18,792 |  |
Equity investments |  | $ 17,417 |
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] |  |  |
Changes in fair value, gain (loss) | $ 551 | $ 539 | 76
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) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 43.00% | 43.00% |
Fair Value | $ 5,140 |  |
Equity investments |  | $ 4,878 |
Equity Method Investments | Audubon Mezzanine Holdings, L.L.C. (Series A) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 1,213 | $ 1,224 | 59
Equity Method Investments | Audubon Mezzanine Holdings, L.L.C. (Series A) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 57.00% | 57.00% |
Fair Value | $ 11,456 |  |
Equity investments |  | $ 10,998 |
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] |  |  |
Changes in fair value, gain (loss) | $ 782 | $ 741 | 0
Equity Method Investments | EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 46.00% | 46.00% |
Fair Value | $ 7,234 |  |
Equity investments |  | $ 6,847 |
Equity Method Investments | Walnut Creek Properties Holdings, L.L.C. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 928 | $ 803 | 0
Equity Method Investments | Walnut Creek Properties Holdings, L.L.C. | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 36.00% | 36.00% |
Fair Value | $ 8,803 |  |
Equity investments |  | $ 8,288 |
Equity Method Investments | Towers Property Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 1,243 | $ 638 | 0
Equity Method Investments | Towers Property Holdings, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 37.00% | 37.00% |
Fair Value | $ 12,119 |  |
Equity investments |  | $ 11,278 |
Equity Method Investments | Mansions Property Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 1,198 | $ 615 | 0
Equity Method Investments | Mansions Property Holdings, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 34.00% | 34.00% |
Fair Value | $ 11,679 |  |
Equity investments |  | $ 10,867 |
Equity Method Investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 454 | $ 188 | 0
Equity Method Investments | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 43.00% | 43.00% |
Fair Value | $ 4,320 |  |
Equity investments |  | $ 4,062 |
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] |  |  |
Changes in fair value, gain (loss) | $ 1,044 | $ 367 | 0
Equity Method Investments | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 37.00% | 37.00% |
Fair Value | $ 9,966 |  |
Equity investments |  | $ 9,396 |
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] |  |  |
Changes in fair value, gain (loss) | $ 1,293 | $ 267 | 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) | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 53.00% | 53.00% |
Fair Value | $ 12,337 |  |
Equity investments |  | $ 11,944 |
Equity Method Investments | DCP Gold Creek, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 701 | $ 0 | 0
Equity Method Investments | DCP Gold Creek, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 44.00% | 0.00% |
Fair Value | $ 6,357 |  |
Equity investments |  | $ 0 |
Equity Method Investments | 1122 Chicago DE, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 835 | $ 0 | 0
Equity Method Investments | 1122 Chicago DE, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 53.00% | 0.00% |
Fair Value | $ 7,222 |  |
Equity investments |  | $ 0 |
Equity Method Investments | Rigsbee Ave Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 1,148 | $ 0 | 0
Equity Method Investments | Rigsbee Ave Holdings, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 56.00% | 0.00% |
Fair Value | $ 10,222 |  |
Equity investments |  | $ 0 |
Equity Method Investments | Bighaus, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 1,002 | $ 0 | 0
Equity Method Investments | Bighaus, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 42.00% | 0.00% |
Fair Value | $ 14,525 |  |
Equity investments |  | $ 0 |
Equity Method Investments | FF/RMI 20 Midtown, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 686 | $ 0 | 0
Equity Method Investments | FF/RMI 20 Midtown, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 51.00% | 0.00% |
Fair Value | $ 23,936 |  |
Equity investments |  | $ 0 |
Equity Method Investments | Lurin-RMI, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 81 | $ 0 | 0
Equity Method Investments | Lurin-RMI, LLC | Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 38.00% | 0.00% |
Fair Value | $ 7,216 |  |
Equity investments |  | $ 0 |
Equity Method Investments | The Preserve at Port Royal Venture, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 0.00% | 77.00% |
Fair Value | $ 0 | $ 18,310 |
Changes in fair value, gain (loss) | $ (949) | $ 5,374 | 1,778
Equity Method Investments | Morrocroft Neighborhood Stabilization Fund II, LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 11.00% | 11.00% |
Fair Value | $ 13,040 | $ 11,796 |
Changes in fair value, gain (loss) | $ 1,519 | $ 843 | 1,131
Equity Method Investments | 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 | $ 63,290 | $ 53,776 |
Changes in fair value, gain (loss) | 9,513 | 3,776 | 0
Equity Method Investments | Evergreens JV Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 5,107 | 4,312
Equity Method Investments | WR Savannah Holdings, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 0 | 1,854
Equity Method Investments | Joint Venture in Multi-family Properties and Entities that Invest In Residential Properties and Loans |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 10,083 | $ 15,100 | $ 9,075

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