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Consolidated K-Series - Narrative (Details) $ in Thousands | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2006 securitization
Variable Interest Entity [Line Items] |  |  |  |  |  |
Mortgage loans on real estate, unpaid principal balance |  | $ 10,157,126 | $ 7,565,459 | $ 7,792,422 | $ 9,107,248 |
Multi-family loans held in securitization trusts |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Mortgage loans on real estate, unpaid principal balance |  | 9,400,000 | 6,700,000 |  |  |
Multi-family collateralized debt obligations, at fair value |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Mortgage loans on real estate, unpaid principal balance |  | $ 9,400,000 | $ 6,700,000 |  |  |
Weighted average interest rate (as a percent) |  | 3.92% | 3.97% |  |  |
Consolidated K-Series |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
K-series net carrying value |  | $ 468,000 | $ 314,900 |  |  |
PO Security |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Proceeds from sale of investments | $ 44,300 |  |  |  |  |
Gain on sale of investments | 1,500 |  |  |  |  |
Multi-Family Collateralized Mortgage Backed Securities |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Deconsolidation of assets | 1,100,000 |  |  |  |  |
Multi-family collateralized debt obligations, at fair value |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Deconsolidation of assets | $ 1,000,000 |  |  |  |  |
K-Series | Consolidated K-Series |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitizations | securitization |  |  |  |  |  | 4

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