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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of the Company's Financial Assets (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial Assets: |  |  |  |
Cash and cash equivalents |  | $ 118,763 | $ 103,724 | $ 95,191
Investment securities, available for sale |  | 2,006,140 | 1,512,252 |
Investment in unconsolidated entities | $ 107,477 | 189,965 | 73,466 |
Mezzanine loan and preferred equity investments | $ 3,620 | 169,214 | 114,821 |
Derivative assets |  | 15,878 | 10,263 |
Financial Liabilities: |  |  |  |
Outstanding Borrowings |  | 2,352,102 | 1,543,577 |
Subordinated debentures |  | 45,000 | 45,000 |
Convertible notes |  | 132,955 | 130,762 |
Residential collateralized debt obligations |  |  |  |
Financial Liabilities: |  |  |  |
Collateralized debt obligations |  | 40,429 | 53,040 |
Residential collateralized debt obligations, at fair value |  |  |  |
Financial Liabilities: |  |  |  |
Collateralized debt obligations |  | 1,052,829 | 0 |
Level 1 |  |  |  |
Financial Assets: |  |  |  |
Cash and cash equivalents |  | 118,763 | 103,724 |
Cash and cash equivalents, estimated fair value |  | 118,763 | 103,724 |
Level 2 |  |  |  |
Financial Assets: |  |  |  |
Derivative assets |  | 15,878 | 10,263 |
Financial Liabilities: |  |  |  |
Convertible notes |  | 132,955 | 130,762 |
Convertible debt, fair value |  | 140,865 | 135,689 |
Level 2 | Portfolio investments |  |  |  |
Financial Liabilities: |  |  |  |
Outstanding Borrowings |  | 3,105,416 | 2,131,505 |
Level 3 |  |  |  |
Financial Assets: |  |  |  |
Investment in unconsolidated entities |  | 189,965 | 73,466 |
Investments in unconsolidated entities, estimated fair value |  | 191,359 | 73,833 |
Mezzanine loan and preferred equity investments |  | 180,045 | 165,555 |
Mezzanine loan and preferred equity investments, estimated fair value |  | 182,465 | 167,739 |
Mortgage loans held for sale, carrying amount |  | 2,406 | 3,414 |
Mortgage loans held for sale, estimated fair value |  | 2,482 | 3,584 |
Mortgage loans held for investment |  | 0 | 1,580 |
Mortgage loans held for investment, estimated fair value |  | 0 | 1,580 |
Financial Liabilities: |  |  |  |
Collateralized debt obligations |  | 0 | 42,335 |
Collateralized debt obligations, fair value |  | 0 | 45,030 |
Subordinated debentures |  | 45,000 | 45,000 |
Subordinated debentures, fair value |  | 41,592 | 44,897 |
Level 3 | Residential collateralized debt obligations |  |  |  |
Financial Liabilities: |  |  |  |
Collateralized debt obligations |  | 40,429 | 53,040 |
Collateralized debt obligations, fair value |  | 38,888 | 50,031 |
Level 3 | Multi-Family CDOs |  |  |  |
Financial Liabilities: |  |  |  |
Collateralized debt obligations |  | 16,724,451 | 11,022,248 |
Collateralized debt obligations, fair value |  | 16,724,451 | 11,022,248 |
Level 3 | Residential collateralized debt obligations, at fair value |  |  |  |
Financial Liabilities: |  |  |  |
Collateralized debt obligations |  | 1,052,829 | 0 |
Collateralized debt obligations, fair value |  | 1,052,829 | 0 |
Level 3 | Distressed and other residential mortgage loans, at fair value |  |  |  |
Financial Assets: |  |  |  |
Distressed and other residential mortgage loans, net |  | 1,429,754 | 737,523 |
Residential mortgage loans held in securitization trust, at fair value |  | 1,429,754 | 737,523 |
Level 3 | Distressed residential mortgage loans |  |  |  |
Financial Assets: |  |  |  |
Distressed and other residential mortgage loans, net |  | 202,756 | 285,261 |
Residential mortgage loans held in securitization trust, at fair value |  | 208,471 | 289,376 |
Level 3 | Multi-family loans held in securitization trusts |  |  |  |
Financial Assets: |  |  |  |
Distressed and other residential mortgage loans, net |  | 17,816,746 | 11,679,847 |
Residential mortgage loans held in securitization trust, at fair value |  | 17,816,746 | 11,679,847 |
Level 3 | Residential mortgage loans held in securitization trusts |  |  |  |
Financial Assets: |  |  |  |
Distressed and other residential mortgage loans, net |  | 1,328,886 | 0 |
Residential mortgage loans held in securitization trust, at fair value |  | $ 1,328,886 | $ 0 |

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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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