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Investments in Equity Affiliates, All Investments (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($)
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Secured debt | $ 2,130,121,000 |  |  |  | $ 1,593,548,000 |  |  |  | $ 2,130,121,000 | $ 1,593,548,000 |  |  |
Noncontrolling interest invested |  |  |  |  |  |  |  |  | 13,522,000 | 2,493,000 | $ 693,000 |  |
Income (loss) from equity affiliates | 1,502,000 | $ 3,718,000 | $ 3,264,000 | $ 2,151,000 | $ 91,000 | $ (1,028,000) | $ 1,387,000 | $ 746,000 | 10,635,000 | 1,196,000 | (2,951,000) |  |
Loan to an affiliated entity | 47,758,000 |  |  |  |  |  |  |  | 47,758,000 |  |  |  |
Loans and investments, gross | 4,279,611,000 |  |  |  |  |  |  |  | 4,279,611,000 |  |  |  |
Multifamily |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of equity participation interest |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  | $ 0
Percentage of equity participation redeemed |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Bridge loans |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and investments, gross | 3,836,832,000 |  |  |  |  |  |  |  | $ 3,836,832,000 |  |  |  |
Arbor Residential Investor LLC | Residential Mortgage Banking Company |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |  |  |  |  | $ 9,600,000 |
Charge for proportionate share of litigation settlement recorded |  |  |  |  |  |  |  |  |  | 2,400,000 | $ 5,500,000 |  |
Indirect ownership percentage |  |  |  |  |  |  |  |  | 16.3% |  |  | 22.5% |
Income (loss) from equity affiliates |  |  |  |  |  |  |  |  | $ 7,200,000 | (700,000) | 7,300,000 |  |
Arbor Residential Investor LLC | Residential Mortgage Banking Company | ACM / Our "Former Manager" |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Arbor Residential Investor LLC | Non-qualified Residential Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Distribution received |  |  |  |  |  |  |  |  |  | $ 700,000 | 3,200,000 |  |
Basis of investment | 0 |  |  |  |  |  |  |  | 0 |  |  |  |
AMAC Holdings III LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution received |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Investment in real estate committed |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Investment in real estate | 10,900,000 |  |  |  |  |  |  |  | 10,900,000 |  |  |  |
Interest in a real estate investment (as a percent) |  |  |  | 18.00% |  |  |  |  |  |  |  |  |
Loan to an affiliated entity | 15,600,000 |  |  |  |  |  |  |  | 15,600,000 |  |  |  |
North Vermont Avenue |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest invested | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest in equity method investment (as a percent) | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
West Shore Cafe |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |  |
Loan to an affiliated entity | $ 1,688,000 |  |  |  |  |  |  |  | $ 1,688,000 |  |  |  |
Other-than-temporary impairment recorded |  |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |
West Shore Cafe | First mortgage |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Provided first mortgage loan to an affiliated entity |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  | 4.00% |  |  |  |
Provision for loan loss recorded |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Lightstone Value Plus REIT L.P |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment | 1,900,000 |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |
JT Prime |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Investment | 400,000 |  |  |  |  |  |  |  | $ 400,000 |  |  |  |
Noncontrolling interest in equity method investment (as a percent) |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
East River Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment made |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Number of properties owned | item |  |  |  |  |  |  |  |  |  |  | 2 |  |
East River Portfolio | Chief executive officer and other related parties |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  |  |  |  |  |  | 95.00% |  |
East River Portfolio | Bridge loans |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and investments, gross |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |
Variable rate, spread (as a percent) |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
Lexford Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  | $ 44,000 |  |
Distribution received |  |  |  |  |  |  |  |  | $ 3,500,000 | $ 2,500,000 | $ 2,500,000 |  |
Loan to an affiliated entity | $ 30,470,000 |  |  |  |  |  |  |  | 30,470,000 |  |  |  |
AMAC III |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in Equity Affiliates |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution received |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Investment in real estate committed |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Income (loss) from equity affiliates |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |

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