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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | May 16, 2016 | Oct. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) securitization | Dec. 31, 2016 USD ($) securitization | Dec. 31, 2015 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Repayments of secured debt | $ |  |  |  | $ 79,433 | $ 126,018 | $ 116,136
Unconsolidated VIE, maximum loss exposure | $ |  |  |  | $ 220,800 | $ 185,300 |
Residential Mortgage Loan Securitization |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitizations completed to date |  |  |  | 4 |  |
Distressed residential mortgage loans |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitizations, accounted for as permanent financing |  |  |  | 3 |  |
K-Series | Non-Financing VIEs, Multi-Family CMBS |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitizations not considered non-financing VIEs |  |  |  | 7 | 5 |
Number of securitizations considered non-financing VIEs |  |  |  | 6 | 4 |
K-Series | Multi-Family Collateralized Mortgage Backed Securities |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitizations |  |  |  | 2 |  |
Riverchase Landing and The Clusters |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Consideration transferred | $ | $ 12,500 |  |  |  |  |
RBDHC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Equity method investment, cumulative percentage ownership after all transactions |  | 100.00% |  |  |  |
RBDHC | VIE, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Variable interest entity, ownership percentage |  | 50.00% |  |  |  |
Collateralized Loan Obligation |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Repayments of secured debt | $ |  |  | $ 55,900 | $ 137,160 | $ 136,314 | $ 85,966

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