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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 14, 2019 USD ($) | Mar. 31, 2017 variable_interest_entity | Jun. 30, 2019 USD ($) securitization | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) securitization | Jun. 30, 2018 USD ($) | Mar. 25, 2019 USD ($) | Dec. 31, 2018 USD ($) securitization
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 0 | $ 0 | $ 2,857 | $ 0 |  |
Unconsolidated VIE, maximum loss exposure |  |  | $ 355,500 |  | $ 355,500 |  |  | $ 269,800
RBDHC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 100.00% |  |  |
Riverchase Landing and The Clusters |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of variable interest entities consolidated | variable_interest_entity |  | 2 |  |  |  |  |  |
Multi-family CMBS Re-securitization |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Principal amount | $ 33,200 |  |  |  |  |  |  | $ 33,177
Loss on extinguishment of debt | $ 2,900 |  |  |  |  |  |  |
Multi-family CMBS Re-securitization | K-Series |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of consolidated securitizations | securitization |  |  |  |  |  |  |  | 1
Distressed Residential Mortgage Loan Securitization |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 6,500 | $ 12,381
Non-Financings, Multi-Family CMBS | K-Series |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of securitizations, non-financing VIE's | securitization |  |  | 11 |  | 11 |  |  | 8
VIE, Primary Beneficiary | RBDHC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership by parent, percentage |  |  |  |  | 50.00% |  |  |
VIE, Primary Beneficiary | K-Series |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of consolidated securitizations | securitization |  |  | 11 |  | 11 |  |  | 9
Residential Mortgage Loans Held In Securitization Trusts Net |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of securitizations completed to date | securitization |  |  | 4 |  | 4 |  |  |
Number of securitizations, consolidated, accounted for as permanent financing | securitization |  |  | 3 |  | 3 |  |  |
Receivables and other assets |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Real estate under development |  |  | $ 16,700 |  | $ 16,700 |  |  | $ 22,000

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