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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) securitization | Sep. 30, 2019 USD ($) securitization | Sep. 30, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 103,724 | $ 65,906 | $ 57,471
Multi-family loans held in securitization trusts, at fair value |  | 11,679,847 | 15,863,264 |
Real estate held for sale in consolidated variable interest entities |  | 29,704 | 0 |
Receivables and other assets |  | 114,821 | 205,642 |
Total Assets | [1] | 14,737,638 | 19,759,249 |
Securitized debt |  | 42,335 | 0 |
Mortgages and notes payable in consolidated variable interest entities |  | 31,227 | 935 |
Accrued expenses and other liabilities |  | 101,228 | 153,722 |
Total Liabilities | [1] | 13,557,345 | 17,912,250 |
Class A Notes | Collateralized Mortgage Obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Proceeds from issuance of secured debt |  | $ 177,500 |  |
Percentage of ownership |  | 5.00% |  |
Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | $ 53,040 | 42,119 |
Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 11,022,248 | 14,978,199 |
Residential Mortgage Loan Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Receivables and other assets |  | 1,061 | 1,274 |
Total Assets |  | 57,856 | 46,946 |
Accrued expenses and other liabilities |  | 26 | 35 |
Total Liabilities |  | 53,066 | 42,154 |
Residential Mortgage Loan Securitization | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 53,040 | 42,119 |
Residential Mortgage Loan Securitization | Residential mortgage loans held in securitization trusts, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential mortgage loans held in securitization trusts, net |  | 56,795 | 45,672 |
Consolidated K-Series |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Receivables and other assets |  | 37,679 | 51,950 |
Total Assets |  | 10,610,455 | 15,915,214 |
Accrued expenses and other liabilities |  | 37,022 | 50,783 |
Total Liabilities |  | 10,022,666 | 15,028,982 |
Consolidated K-Series | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  |  | 0 |
Consolidated K-Series | Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 9,985,644 | 14,978,199 |
Consolidated K-Series | Multi-family loans held in securitization trusts, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family loans held in securitization trusts, at fair value |  | 10,572,776 | 15,863,264 |
Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 708 | 656 |
Real estate held for sale in consolidated variable interest entities |  | 29,704 |  |
Receivables and other assets |  | 23,254 | 14,098 |
Total Assets |  | 53,666 | 14,754 |
Mortgages and notes payable in consolidated variable interest entities |  | 31,227 | 935 |
Accrued expenses and other liabilities |  | 1,166 | 120 |
Total Liabilities |  | 32,393 | 1,055 |
Other | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  |  | 0 |
Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 708 | 656 |
Investment securities available for sale |  | 52,700 |  |
Real estate held for sale in consolidated variable interest entities |  | 29,704 |  |
Receivables and other assets |  | 76,524 | 67,322 |
Total Assets |  | 11,984,374 | 15,976,914 |
Securitized debt |  | 42,335 |  |
Mortgages and notes payable in consolidated variable interest entities |  | 31,227 | 935 |
Accrued expenses and other liabilities |  | 42,886 | 50,938 |
Total Liabilities |  | 11,191,736 | 15,072,191 |
Financing And Other VIEs | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 53,040 | 42,119 |
Financing And Other VIEs | Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 11,022,248 | 14,978,199 |
Financing And Other VIEs | Residential mortgage loans held in securitization trusts, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential mortgage loans held in securitization trusts, net |  | 56,795 | 45,672 |
Financing And Other VIEs | Distressed residential mortgage loans held in securitization trusts, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential mortgage loans held in securitization trusts, net |  | 88,096 |  |
Financing And Other VIEs | Multi-family loans held in securitization trusts, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family loans held in securitization trusts, at fair value |  | 11,679,847 | $ 15,863,264 |
Multi-family CMBS Re-securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 |  |
Investment securities available for sale |  | 52,700 |  |
Receivables and other assets |  | 4,243 |  |
Total Assets |  | 1,164,014 |  |
Securitized debt |  | 30,121 |  |
Accrued expenses and other liabilities |  | 4,228 |  |
Total Liabilities |  | $ 1,070,953 |  |
Multi-family CMBS Re-securitization | Consolidated K-Series |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Number of securitizations | securitization |  | 2 |  |
Number of consolidated securitizations | securitization |  | 1 |  |
Multi-family CMBS Re-securitization | Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | $ 1,036,604 |  |
Multi-family CMBS Re-securitization | Multi-family loans held in securitization trusts, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family loans held in securitization trusts, at fair value |  | 1,107,071 |  |
Distressed Residential Mortgage Loan Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 |  |
Receivables and other assets |  | 10,287 |  |
Total Assets |  | 98,383 |  |
Securitized debt |  | 12,214 |  |
Accrued expenses and other liabilities |  | 444 |  |
Total Liabilities |  | 12,658 |  |
Distressed Residential Mortgage Loan Securitization | Distressed residential mortgage loans held in securitization trusts, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential mortgage loans held in securitization trusts, net |  | $ 88,096 |  |
Non Financings Multi Family CMBS | Consolidated K-Series |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Number of securitizations, non-financing VIE's | securitization |  | 8 | 12 |
[1] | Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2019 and December 31, 2018, assets of consolidated VIEs totaled $15,976,914 and $11,984,374, respectively, and the liabilities of consolidated VIEs totaled $15,072,191 and $11,191,736, respectively. See Note 9 for further discussion.

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