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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 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 293,183 | $ 118,763 | $ 103,724
Residential loans, carrying value | 3,049,166 | 2,961,396 |
Investment securities, available for sale | 311,284 | 1,760,812 |
Equity investments | 259,095 | 189,965 |
Derivative assets | 0 | 15,878 |
Financial Liabilities: |  |  |
Outstanding Borrowings |  | 2,352,102 |
Subordinated debentures | 45,000 | 45,000 |
Convertible notes | 135,327 | 132,955 |
Residential Collateralized Debt Obligations |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 569,323 | 40,429 |
Residential Collateralized Debt Obligations | VIE, Primary Beneficiary |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 569,323 | 40,429 |
Residential collateralized debt obligations, at fair value |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 1,054,335 | 17,777,280 |
Residential collateralized debt obligations, at fair value | VIE, Primary Beneficiary |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 1,054,335 | 17,777,280 |
Level 1 |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 293,183 | 118,763 |
Cash and cash equivalents, estimated fair value | 293,183 | 118,763 |
Level 2 |  |  |
Financial Assets: |  |  |
Investment securities, available for sale | 724,726 | 2,006,140 |
Derivative assets | 0 | 15,878 |
Financial Liabilities: |  |  |
Convertible notes | 135,327 | 132,955 |
Convertible debt, fair value | 137,716 | 140,865 |
Level 2 | Portfolio investments |  |  |
Financial Liabilities: |  |  |
Outstanding Borrowings | 405,531 | 3,105,416 |
Level 3 |  |  |
Financial Assets: |  |  |
Preferred equity and mezzanine loan investments | 163,593 | 180,045 |
Preferred equity and mezzanine loan investments, estimated fair value | 163,593 | 182,465 |
Equity investments | 259,095 | 189,965 |
Equity investments, estimated fair value | 259,095 | 191,359 |
Mortgage loans held for sale, carrying amount | 0 | 2,406 |
Mortgage loans held for sale, estimated fair value | 0 | 2,482 |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 15,256 | 0 |
Collateralized debt obligations, fair value | 15,472 | 0 |
Subordinated debentures | 45,000 | 45,000 |
Subordinated debentures, fair value | 36,871 | 41,592 |
Level 3 | Residential Collateralized Debt Obligations |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 554,067 | 40,429 |
Collateralized debt obligations, fair value | 561,329 | 38,888 |
Level 3 | Multi Family Collateralized Debt Obligations |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 0 | 16,724,451 |
Collateralized debt obligations, fair value | 0 | 16,724,451 |
Level 3 | Residential collateralized debt obligations, at fair value |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value |  | 1,052,829 |
Collateralized debt obligations, fair value | 1,054,335 |  |
Level 3 | Residential collateralized debt obligations, at fair value | VIE, Primary Beneficiary |  |  |
Financial Liabilities: |  |  |
Collateralized debt obligations, at fair value | 1,054,335 |  |
Level 3 | Residential loans, at fair value |  |  |
Financial Assets: |  |  |
Residential loans, carrying value | 3,049,166 | 2,758,640 |
Residential mortgage loans at fair value | 3,049,166 | 2,758,640 |
Level 3 | Residential Mortgage Loans |  |  |
Financial Assets: |  |  |
Residential loans, carrying value | 0 | 202,756 |
Residential mortgage loans at fair value | 0 | 208,471 |
Level 3 | Multi-family loans held in securitization trusts |  |  |
Financial Assets: |  |  |
Residential loans, carrying value | 0 | 17,816,746 |
Residential mortgage loans at fair value | $ 0 | $ 17,816,746 |

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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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