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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 |  |
--- | --- | --- | --- | --- | ---
Mar. 14, 2019 USD ($) | Mar. 31, 2017 variable_interest_entity | Mar. 31, 2019 USD ($) securitization | Mar. 31, 2018 USD ($) | Mar. 25, 2019 USD ($) | Dec. 31, 2018 USD ($) securitization
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 2,857 | $ 0 |  |
Real estate under development |  |  | $ 20,900 |  |  |
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 |  |  |  |  |
Distressed Residential Mortgage Loan Securitization |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 6,500 | $ 12,381
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 |  |  | 9
VIE, Primary Beneficiary | Other Income | RBDHC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Impairment of real estate under development |  |  | $ 900 |  |  |
VIE, Primary Beneficiary | Net Income Attributable to Noncontrolling Interest | RBDHC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Impairment of real estate under development |  |  | 500 |  |  |
VIE, Primary Beneficiary | Net Loss Attributable to Parent | RBDHC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Impairment of real estate under development |  |  | $ 400 |  |  |
Non-Financings, Multi-Family CMBS | K-Series |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of securitizations, non-financing VIE's | securitization |  |  | 11 |  |  | 8
Receivables and other assets |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Real estate under development |  |  | $ 20,000 |  |  | $ 22,000

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