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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 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets: |  |
Cash and cash equivalents | $ 101,904 | $ 83,554
Fair Value | 674,161 | 818,976
Derivative assets | 182,115 | 150,296
Mezzanine loan and preferred equity investments, carrying value | 123,944 | 138,323
Financial Liabilities |  |
Financing arrangements | 608,304 | 773,142
Derivative liabilities | 467 | 498
Subordinated debentures, carrying value | 45,000 | 45,000
Convertible notes, carrying value | 128,273 | 0
Distressed residential mortgage loans held in securitization trusts, carrying amount | 133,972 | 195,347
Distressed residential mortgage loans |  |
Financial Assets: |  |
Residential mortgage loans held in securitization trusts (net) | 235,700 | 307,700
Financial Liabilities |  |
Distressed residential mortgage loans held in securitization trusts, carrying amount | 369,700 | 503,100
Distressed residential mortgage loans |  |
Financial Liabilities |  |
Distressed residential mortgage loans held in securitization trusts, carrying amount | 134,000 | 195,300
Equity Method Investments |  |
Financial Assets: |  |
Investment in unconsolidated entities, carrying value | 10,242 | 18,927
Investments in unconsolidated entities, estimated fair value | 41,026 | 60,332
Portfolio Investments |  |
Financial Liabilities |  |
Financing arrangements | 608,304 | 773,142
Residential collateralized debt obligations |  |
Financial Liabilities |  |
Secured debt, carrying value | 76,867 | 91,663
Multi-family collateralized debt obligations |  |
Financial Liabilities |  |
Secured debt, carrying value | 7,990,619 | 6,624,896
Available-for-sale securities |  |
Financial Liabilities |  |
Investment securities, available for sale, at fair value (including $46,623 and $43,897 held in securitization trusts as of September 30, 2017 and December 31, 2016, respectively, and pledged securities of $493,632 and $690,592, as of September 30, 2017 and December 31, 2016, respectively) | 46,623 | 43,897
Level 1 |  |
Financial Assets: |  |
Cash and cash equivalents | 101,904 | 83,554
Cash and cash equivalents, estimated fair value | 101,904 | 83,554
Receivable for securities sold, carrying value | 1,261 | 0
Receivable for securities sold, estimated fair value | 1,261 | 0
Financial Liabilities |  |
Payable for securities purchased, carrying value | 181,718 | 148,015
Payable for securities purchased, estimated fair value | 181,718 | 148,015
Level 3 |  |
Financial Assets: |  |
Mortgage loans held for sale (net), carrying value | 6,797 | 7,847
Mortgage loans held for sale (net), estimated fair value | 6,899 | 7,959
Mortgage loans held for investment, carrying value | 1,760 | 19,529
Mortgage loans held for investment, estimated fair value | 1,900 | 19,641
Mezzanine loan and preferred equity investments, carrying value | 122,578 | 100,150
Mezzanine loan and preferred equity investments, estimated fair value | 124,436 | 101,408
Investment in unconsolidated entities, carrying value | 51,268 | 79,259
Investments in unconsolidated entities, estimated fair value | 51,342 | 79,390
Financial Liabilities |  |
Secured debt, carrying value | 98,371 | 158,867
Secured debt, estimated fair value | 105,768 | 163,884
Subordinated debentures, carrying value | 45,000 | 45,000
Subordinated debentures, estimated fair value | 44,989 | 43,132
Level 3 | Residential collateralized debt obligations |  |
Financial Liabilities |  |
Secured debt, carrying value | 76,867 | 91,663
Secured debt, estimated fair value | 72,428 | 85,568
Level 3 | Multi-family collateralized debt obligations |  |
Financial Liabilities |  |
Secured debt, carrying value | 7,990,619 | 6,624,896
Secured debt, estimated fair value | 7,990,619 | 6,624,896
Level 3 | Residential mortgage loans held in securitization trusts |  |
Financial Assets: |  |
Residential mortgage loans held in securitization trusts (net) | 79,875 | 95,144
Residential mortgage loans held in securitization trusts (net), estimated fair value | 77,412 | 88,718
Level 3 | Distressed residential mortgage loans |  |
Financial Assets: |  |
Residential mortgage loans held in securitization trusts (net) | 369,651 | 503,094
Residential mortgage loans held in securitization trusts (net), estimated fair value | 374,169 | 504,915
Level 3 | Residential mortgage loans, at fair value |  |
Financial Assets: |  |
Residential mortgage loans held in securitization trusts (net) | 69,512 | 17,769
Residential mortgage loans held in securitization trusts (net), estimated fair value | 69,512 | 17,769
Level 3 | Multi-family loans held in securitization trusts |  |
Financial Assets: |  |
Residential mortgage loans held in securitization trusts (net) | 8,399,334 | 6,939,844
Residential mortgage loans held in securitization trusts (net), estimated fair value | 8,399,334 | 6,939,844
Level 1 and 2 |  |
Financial Assets: |  |
Derivative assets | 182,115 | 150,296
Financial Liabilities |  |
Derivative liabilities | 467 | 498
Level 2 |  |
Financial Liabilities |  |
Convertible notes, carrying value | 128,273 | 0
Convertible notes, estimated fair value | 138,697 | 0
Level 2 | Portfolio Investments |  |
Financial Liabilities |  |
Financing arrangements | 608,304 | 773,142
Level 2 | Distressed residential mortgage loans |  |
Financial Liabilities |  |
Financing arrangements | $ 160,562 | $ 192,419

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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://www.xbrl.org/2003/role/presentationRef -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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